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"}]},{"css":"","js":"function waitFor(selector) {\n return new Promise(resolve => {\n const el = document.querySelector(selector);\n if (el) return resolve(el);\n const observer = new MutationObserver(() => {\n const el = document.querySelector(selector);\n if (el) { observer.disconnect(); resolve(el)}\n });\n observer.observe(document, {childList: true, subtree: true});\n });\n}\n\n// Your code will now wait for the element matching both classes to appear\nwaitFor(\".MmaLayout_main__yJkVx .Cancel_content__lRvrx\").then((el) => {\n el.innerHTML = \"Hello World!\";\n});","domMutations":[{"selector":".MmaLayout_main__yJkVx .Cancel_content__lRvrx","action":"set","attribute":"html","value":"

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"},{"selector":".MmaLayout_main__yJkVx .Cancel_content__lRvrx","action":"set","attribute":"html","value":"

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"},{"selector":".MmaLayout_main__yJkVx .Cancel_content__lRvrx","action":"set","attribute":"html","value":"

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"}]}],"hashVersion":2,"hashAttribute":"id","fallbackAttribute":"","disableStickyBucketing":false,"bucketVersion":1,"minBucketVersion":0,"urlPatterns":[{"include":true,"type":"simple","pattern":"https://www.which.co.uk/join/mma/cancel?subscription=982622838&expires=1768435200000&rateId=8a28a81a96add7d40196c9f0563c631e"}],"weights":[0.3334,0.3333,0.3333],"meta":[{"key":"0","name":"Control"},{"key":"1","name":"Variation 1 - Empowerment & Control"},{"key":"2","name":"Variation 2 - MSC all benefits"}],"filters":[],"seed":"a27b728b-81c7-45d8-a37a-f483570c9434","name":"RET 001 [My Account] Alternative member benefits during cancellation","phase":"0","condition":{"id":"3a570725-2ef9-4a61-9841-35696ea5f02f"},"coverage":1},{"key":"ret-001-my-account-alternative-member-benefits-cancellation-copy","changeId":"255a57275e91a0239a928b85835bbb7cbb08b0721bd3a6536167185b9707685e","status":"draft","variations":[{"css":"","js":"","domMutations":[]},{"css":"","js":"// Define the HTML content (V1)\nconst htmlToInsertV1 = `

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`;\n\n// Define the function to be called by the developer\nfunction ABTestRET001() {\n const selector = \".MmaLayout_main__yJkVx .Cancel_content__lRvrx\";\n const el = document.querySelector(selector);\n \n if (el) {\n el.innerHTML = htmlToInsertV1;\n console.log(\"ABTestRET001: Content replaced successfully.\");\n } else {\n console.error(`ABTestRET001: Target element not found using selector: ${selector}`);\n }\n}\n\n// Attach the function to the window object\nwindow.ABTestRET001 = ABTestRET001;","domMutations":[]},{"css":"","js":"function waitForElement(selector, maxTries = 80, delay = 250) {\n return new Promise((resolve, reject) => {\n \n // Immediate check: Try to find the element right away\n const el = document.querySelector(selector);\n if (el) {\n return resolve(el);\n }\n\n let tries = 0;\n // Polling loop: Used if the element loads asynchronously later\n const interval = setInterval(() => {\n const el = document.querySelector(selector);\n\n // Check for the element's existence\n if (el) {\n clearInterval(interval);\n resolve(el);\n return;\n }\n\n tries++;\n if (tries >= maxTries) {\n clearInterval(interval);\n console.log(`Element ${selector} not found after ${maxTries} tries. Aborting poll.`);\n }\n }, delay);\n });\n}\n\n// HTML content for the \"Are you sure?\" variant (V2)\n// Define the HTML content (V2)\nconst htmlToInsertV2 = `

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`;\n\n// Define the function for V2\nfunction ABTestRET002() {\n const selector = \".MmaLayout_main__yJkVx .Cancel_content__lRvrx\";\n const el = document.querySelector(selector);\n \n if (el) {\n el.innerHTML = htmlToInsertV2;\n console.log(\"ABTestRET002: Content replaced successfully.\");\n } else {\n console.error(`ABTestRET002: Target element not found using selector: ${selector}`);\n }\n}\n\n// Attach the function to the window object\nwindow.ABTestRET002 = ABTestRET002;\n// Execute the polling function immediately\nwaitForElement(\".MmaLayout_main__yJkVx .Cancel_content__lRvrx\").then((el) => {\n el.innerHTML = htmlToInsertV2;\n});","domMutations":[]}],"hashVersion":2,"hashAttribute":"id","fallbackAttribute":"","disableStickyBucketing":false,"bucketVersion":1,"minBucketVersion":0,"urlPatterns":[{"include":true,"type":"simple","pattern":"https://dev.internal.which.co.uk/join/mma/cancel?subscription=S00002912&expires=1765497600000&rateId=8adc96cf8736ea83018738860ec6490f"}],"weights":[0,1,0],"meta":[{"key":"0","name":"Control"},{"key":"1","name":"Variation 1 - Empowerment & Control"},{"key":"2","name":"Variation 2 - MSC all benefits"}],"filters":[],"seed":"a27b728b-81c7-45d8-a37a-f483570c9434","name":"RET 001 [My Account] Alternative member benefits during cancellation (Copy)","phase":"0","condition":{"id":"3a570725-2ef9-4a61-9841-35696ea5f02f"},"coverage":1},{"key":"acq-002-payment-page-add-alternative-payment-options","changeId":"7e70c03c12cb3ce31289cb5c1968963a540b527967752f2fc1653f9c6c73a4ca","status":"draft","variations":[{"css":"","js":"","domMutations":[]},{"css":"","js":"","domMutations":[{"selector":".gn__navigationCtas-module__loggedOutCtas-vCcjO .gn__links-module__giftLink-pYprf","action":"set","attribute":"style","value":"opacity: 0"}]}],"hashVersion":2,"hashAttribute":"","fallbackAttribute":"","disableStickyBucketing":false,"urlPatterns":[{"include":true,"type":"simple","pattern":"https://www.which.co.uk/"}],"weights":[0.5,0.5],"meta":[{"key":"0","name":"Control"},{"key":"1","name":"Variation 1"}],"filters":[],"seed":"1cc71a56-93b5-41a3-85c4-6b2171311376","name":"ACQ 002 [Payment Page] Add alternative payment options","phase":"0","coverage":1},{"key":"mobile-pp-test","changeId":"ff119153d7eb5db241dd1ea040d811693397f55c82bf7e059ca75777272a8477","status":"draft","variations":[{"css":"","js":"","domMutations":[]},{"css":"","js":"(function() {\n // 1. Mobile Check\n const isMobile = window.innerWidth <= 768;\n if (!isMobile) return;\n\n // 2. Polling: Wait for BOTH the Article and the Destination Grid\n const intervalId = setInterval(function() {\n \n // Selector for the Article (using wildcard for safety)\n const articleElement = document.querySelector('article[class*=\"LoggedOutMemberBenefits_panel\"]');\n \n // Selector for the Destination (The Featured Links Grid)\n const destinationContainer = document.querySelector('section[data-testid=\"featuredLinks\"] section[data-testid=\"grid\"]');\n\n // Only proceed if BOTH exist\n if (articleElement && destinationContainer) {\n clearInterval(intervalId);\n\n // --- PART A: Edit Content (Slimline) ---\n const legalSmallPrint = articleElement.querySelector('p[class*=\"SignupButton_caption\"]');\n \n if (legalSmallPrint) {\n const parentOfLegalSmallPrint = legalSmallPrint.parentElement;\n \n // Remove siblings after legal print\n let currentNode = parentOfLegalSmallPrint.nextElementSibling;\n while (currentNode) {\n const next = currentNode.nextElementSibling;\n currentNode.remove();\n currentNode = next;\n }\n\n // Remove Footer\n const footerElement = articleElement.querySelector('[class*=\"ContextualPanelFooter_footer\"]');\n if (footerElement) {\n footerElement.remove();\n }\n\n // Reset Height to auto so it shrinks to fit new content size\n articleElement.style.minHeight = 'auto';\n articleElement.style.height = 'auto';\n }\n\n // --- PART B: Reposition and Rebalance Spacing ---\n \n // Get the GRID WRAPPER (the parent div with GridItem classes)\n const gridWrapper = articleElement.closest('div[class*=\"GridItem\"]');\n\n if (gridWrapper) {\n // 1. Move it to the top\n destinationContainer.prepend(gridWrapper);\n\n // 2. Apply Styles to Fix Grid Position and Spacing\n // We use cssText to apply multiple styles at once.\n // !important is needed to override existing class styles.\n gridWrapper.style.cssText += `\n grid-column-start: 1 !important; \n grid-row-start: 1 !important;\n margin-top: 0px !important;\n margin-bottom: 32px !important; \n `;\n \n // NOTE: You can adjust '32px' above to '24px' or '40px' depending on preferred balance.\n }\n }\n }, 100); // Check every 100ms\n\n // 3. 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Essential for SPAs where \n * elements may be unmounted/remounted without a page refresh.\n */\n const resolveElements = () => {\n sidebarEl = document.querySelector(CONFIG.selectors.sidebar);\n footerEl = document.querySelector(CONFIG.selectors.footer);\n return !!(sidebarEl && footerEl);\n };\n\n /**\n * Main calculation and DOM update logic\n */\n const updatePosition = () => {\n // Check connectivity and re-resolve if necessary (SPA safety)\n if (!sidebarEl?.isConnected || !footerEl?.isConnected) {\n if (!resolveElements()) {\n isTicking = false;\n return;\n }\n }\n\n const footerRect = footerEl.getBoundingClientRect();\n const sidebarHeight = sidebarEl.offsetHeight;\n \n // Calculate the 'ideal' bottom edge of the sidebar\n const idealBottom = CONFIG.offsets.topPadding + sidebarHeight;\n\n // Calculate how much the sidebar would overlap with the footer\n const overlap = (idealBottom + CONFIG.offsets.footerBuffer) - footerRect.top;\n\n // Determine the target top value\n const targetTop = overlap > 0 \n ? CONFIG.offsets.topPadding - overlap \n : CONFIG.offsets.topPadding;\n\n // Optimization: Only write to the DOM if the change exceeds the threshold\n const currentTop = parseFloat(sidebarEl.style.top) || CONFIG.offsets.topPadding;\n \n if (Math.abs(currentTop - targetTop) > CONFIG.threshold) {\n sidebarEl.style.top = `${targetTop}px`;\n }\n\n isTicking = false;\n };\n\n /**\n * Scroll event coordinator\n */\n const onScroll = () => {\n if (!isTicking) {\n window.requestAnimationFrame(updatePosition);\n isTicking = true;\n }\n };\n\n /**\n * Initialization Logic\n */\n const init = () => {\n // Attach listener regardless of initial presence to handle late hydration/lazy-loading\n window.addEventListener('scroll', onScroll, { passive: true });\n \n // Initial execution\n if (resolveElements()) {\n updatePosition();\n }\n };\n\n // Execute on DOM ready or immediately if already loaded\n if (document.readyState === 'loading') {\n document.addEventListener('DOMContentLoaded', init);\n } else {\n init();\n }\n})();","domMutations":[]}],"hashVersion":2,"hashAttribute":"id","fallbackAttribute":"","disableStickyBucketing":false,"bucketVersion":1,"minBucketVersion":0,"urlPatterns":[{"include":true,"type":"regex","pattern":"^https:\\/\\/www\\.which\\.co\\.uk\\/reviews\\/.*\\/article\\/.*"}],"weights":[0,1],"meta":[{"key":"0","name":"Control"},{"key":"1","name":"Variation 1"}],"filters":[],"seed":"815ff010-2868-46c5-a545-a6f03992d85e","name":"EXP 037 [Advice] Restrict sidebar from entering footer area","phase":"13","condition":{"id":{"$regex":"317a05de-0554-4d51-b4d6-827f494c134e|2aee58cc-137b-41b2-a5a9-a0275045a949|fc4a08d3-be26-4384-88cb-0c14696b77e6"},"content_type":"advice"},"coverage":1},{"key":"visual-editor-work-registration-consent-messaging","changeId":"6376b58d65571588bc602a7addb5f57126669ae9fc55a7461017d438dd94781d","status":"draft","variations":[{"css":"","js":"","domMutations":[]},{"css":"","js":"/**\n * GrowthBook Experiment: Consent UI Refactor (SPA Optimized)\n * Uses MutationObserver for efficiency and reliability on client-side rendered pages.\n */\n\n(function() {\n const selectors = {\n marketingHeader: '.MarketingPreferences_marketingConsentHeading__U4eQ4',\n emailInput: 'input#email',\n marketingRows: '.MarketingPreferences_marketingConsent__w-eQG',\n disclaimerTexts: 'p.Typography_sb-text-body-default-regular__Ijv90'\n };\n\n // 1. CSS Injection\n const injectStyles = () => {\n if (document.getElementById('gb-experiment-styles')) return;\n const style = document.createElement('style');\n style.id = 'gb-experiment-styles';\n style.textContent = `\n .gb-new-consent-wrapper {\n margin: 24px 0;\n font-family: Arial, sans-serif;\n clear: both;\n }\n .gb-header { font-size: 18px; font-weight: 700; margin-bottom: 8px; color: #000; }\n .gb-subheader { font-size: 14px; margin-bottom: 20px; color: #333; }\n .gb-card {\n border: 1px solid #ced4da;\n border-radius: 8px;\n padding: 16px;\n margin-bottom: 12px;\n display: flex;\n align-items: flex-start;\n cursor: pointer;\n transition: all 0.2s ease;\n background: #fff;\n }\n .gb-card:hover { border-color: #0056b3; }\n .gb-card.selected { border-color: #0056b3; background-color: #f8fbff; }\n .gb-checkbox-ui {\n width: 20px; height: 20px; border: 2px solid #ced4da; border-radius: 4px;\n margin-right: 16px; flex-shrink: 0; position: relative; top: 2px;\n }\n .gb-card.selected .gb-checkbox-ui { background-color: #0056b3; border-color: #0056b3; }\n .gb-card.selected .gb-checkbox-ui::after {\n content: ''; position: absolute; left: 6px; top: 2px; width: 5px; height: 10px;\n border: solid white; border-width: 0 2px 2px 0; transform: rotate(45deg);\n }\n .gb-card-title-row { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; font-weight: 700; font-size: 16px; color: #000; }\n .gb-badge { background-color: #0056b3; color: white; font-size: 11px; padding: 2px 8px; border-radius: 12px; }\n .gb-card-desc { font-size: 14px; color: #555; line-height: 1.4; }\n .gb-hidden { position: absolute !important; height: 1px !important; width: 1px !important; overflow: hidden !important; clip: rect(1px, 1px, 1px, 1px) !important; }\n `;\n document.head.appendChild(style);\n };\n\n // 2. 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\n `;\n\n // Insert after Email Field Wrapper\n const emailFieldRoot = emailInput.closest('.FormField_formField__2Ofjx');\n if (emailFieldRoot) emailFieldRoot.after(wrapper);\n\n // Functional Logic\n const setupCard = (id, consentName) => {\n const card = document.getElementById(id);\n if (!card) return;\n card.onclick = () => {\n const isSelected = card.classList.toggle('selected');\n const radio = document.querySelector(`input[name=\"${consentName}Consent\"][value=\"${isSelected ? 'Yes' : 'No'}\"]`);\n if (radio) {\n radio.click(); // Triggers GTM/GA\n radio.dispatchEvent(new Event('change', { bubbles: true }));\n }\n };\n // Default to 'No'\n const noRadio = document.querySelector(`input[name=\"${consentName}Consent\"][value=\"No\"]`);\n if (noRadio) noRadio.click();\n };\n\n setupCard('gb-card-email', 'email');\n setupCard('gb-card-post', 'post');\n };\n\n // 3. Execution & SPA Handling\n const observer = new MutationObserver((mutations, obs) => {\n const emailField = document.querySelector(selectors.emailInput);\n if (emailField) {\n applyExperiment();\n }\n });\n\n observer.observe(document.body, { childList: true, subtree: true });\n \n // Immediate execution attempt\n applyExperiment();\n})();","domMutations":[]}],"hashVersion":2,"hashAttribute":"id","fallbackAttribute":"","disableStickyBucketing":false,"urlPatterns":[{"include":true,"type":"simple","pattern":"https://www.which.co.uk/registration"}],"weights":[0,1],"meta":[{"key":"0","name":"Control"},{"key":"1","name":"Variation 1"}],"filters":[],"seed":"c6878b3b-142b-4f8e-abc6-3407c718f8b4","name":"Does visual editor work on Registration for consent messaging","phase":"0","condition":{"id":"317a05de-0554-4d51-b4d6-827f494c134e"},"coverage":1},{"key":"dsp-030-sitewide-replace-purple-resubscribe-banner-with-global-nav-join-ctas","changeId":"aecf2abd4454133ba4ab95fc81722ba0c2514ce5fab3768db18d4272c706096a","status":"draft","variations":[{"css":"","js":"","domMutations":[]},{"css":"#test_resub_cta.a {\n margin-bottom: 0px !important;\n},\n#test_resub_cta.a {\n padding-top: 0px !important;\n}","js":"console.log('testing')\nconst observer = new MutationObserver(() => {\n const banner = document.querySelector('[data-testid=\"resub-banner\"]');\n if (banner) {\n banner.remove();\n observer.disconnect();\n }\n});\n\nobserver.observe(document.body, {\n childList: true,\n subtree: true\n});\n\n(function () {\n const parentSel = '.gn__navigation-module__headerTop--aU1K';\n const loggedInCtaSel = '[data-binding=\"logged-in-cta\"]';\n const injectedId = 'test_resub_cta';\n\n const desktopMQ = window.matchMedia('(min-width: 1024px)');\n\n const ctaHtml = `\n

\n \n Subscribe\n \n

\n `;\n\n const insert = () => {\n if (!desktopMQ.matches) return;\n\n if (document.getElementById(injectedId)) return;\n\n const parent = document.querySelector(parentSel);\n const loggedInCta = parent?.querySelector(loggedInCtaSel);\n if (!parent || !loggedInCta) return;\n\n const temp = document.createElement('div');\n temp.innerHTML = ctaHtml.trim();\n const node = temp.firstElementChild;\n\n loggedInCta.insertAdjacentElement('afterend', node);\n };\n\n const remove = () => {\n const node = document.getElementById(injectedId);\n if (node) node.remove();\n };\n\n // Ejecutar al cargar\n desktopMQ.matches ? insert() : remove();\n\n // Escuchar cambios de viewport\n desktopMQ.addEventListener('change', (e) => {\n e.matches ? insert() : remove();\n });\n\n // Observer por si React re-renderiza el header\n const observer = new MutationObserver(() => {\n if (desktopMQ.matches) insert();\n });\n\n observer.observe(document.documentElement, {\n childList: true,\n subtree: true\n });\n})();","domMutations":[]}],"hashVersion":2,"hashAttribute":"","fallbackAttribute":"","disableStickyBucketing":false,"urlPatterns":[{"include":true,"type":"simple","pattern":"https://www.which.co.uk"}],"weights":[0.5,0.5],"meta":[{"key":"0","name":"Control"},{"key":"1","name":"Variation 1"}],"filters":[],"seed":"b488ca06-1df0-4ceb-8542-10f96d9f8bf0","name":"DSP 030 [Sitewide] Replace purple re-subscribe banner with global nav join CTAs","phase":"0","coverage":1}]

Rob Ashford

2026

Financial wellbeing in January 2026

2025

Financial wellbeing in December 2025

Payments: The consumer desire for control

Financial wellbeing in November 2025

Financial wellbeing in October 2025

Warming up to change: Homeowners’ uptake and attitudes towards home energy technology

Financial wellbeing in September 2025

Broadband companies’ customer service: Who is failing consumers?

Airline companies’ customer service: Who is failing consumers?

Energy companies’ customer service: Who is failing consumers?

2024

Understanding Consumer and Business Perspectives on Consumer Protection Regulations

Consumer trust and concerns in November 2024

Consumer engagement with smart electricity tariffs

Which?’s Annual Sustainability Report Series 2024: Electric Vehicles

Which?’s Annual Sustainability Report Series 2024: Home insulation and Heating

Supporting consumers to make healthier food choices

Consumer harm from poor customer service in the energy and broadband sectors

Consumer trust and concerns in August 2024

Financial wellbeing in July 2024

Airlines: Where is customer service going wrong?