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  3. Lisa Galliers
Lisa Galliers - Team Manager - Product Testing at Which?

Lisa Galliers

Team Manager - Product Testing

A veteran consumer advocate with over two decades of rigorous product-testing experience, Lisa leads our mattress category and joined the home energy team, helping bring clear, actionable advice to consumers.

87 articles
  1. 2026

    1. 06 Nov
      Dual-layer mattress with a white top layer and a grey base, set against a soft pink background.

      Best Black Friday mattress deals 2026

      Mattresses
    2. 04 Nov
      Which? mattress expert, Lisa Galliers at the mattress test lab

      5 things I'd never do as a mattress expert

      Bedroom
    3. 30 Oct
      An external heat exchanger for an air-source heat pump, surrounded by green grass and a stone pathway.

      How does the Boiler Upgrade Scheme work?

      Home grants
    4. 29 Oct
      Modern kitchen with light cabinets, a black countertop, a stainless steel oven, and decorative plants on shelves.

      Free boilers and boiler grants

      Boilers
    5. 21 Oct
      Oil boiler

      Best oil boiler brands

      Boilers
    6. 21 Oct
      Wall-mounted water heater with a sleek silver design, two water inlet/outlet pipes, and a light-colored tiled wall.

      Best electric boiler brands

      Boilers
    7. 20 Oct
      Man with a beard in a light blue polo shirt smiles while writing on a clipboard, with a boiler in the background.

      How we assess boilers

      Boilers
    8. 20 Oct
      Mattress on a wooden bed frame, partially covered by a light yellow blanket. An IKEA label is visible on the side.

      The 5 most popular Ikea mattresses

      Mattresses
    9. 19 Oct
      A technician adjusts the controls of a heating boiler, holding a clipboard in their other hand.

      One simple way to adjust your boiler to lower your heating bill

      Heating & energy
    10. 19 Oct
      A hand adjusts a mechanical timer dial on a boiler control panel, featuring various buttons and a digital display.

      Boiler controls and how they can save you money

      Boilers
    11. 19 Oct
      A woman adjusts a control knob on a white boiler, with clothing hanging on racks in the background.

      Boiler energy efficiency explained

      Boilers
    12. 19 Oct
      A person holds a digital thermostat displaying temperature and budget readings, with a soft-focus background.

      Top tips to reduce your heating bills

      Boilers
    13. 19 Oct
      Modern kitchen featuring a white sink, microwave, and a wall-mounted hydrogen boiler with a blue water drop logo labeled "H2.

      Hydrogen boilers: what you need to know

      Boilers
    14. 19 Oct
      Worker in a hard hat and safety vest checks a clipboard in front of a heating boiler, with pipes visible in the background.

      How to buy the best boiler

      Boilers
    15. 19 Oct
      Blue flames flicker above a gas stove burner, with metallic edges of the burner visible against a dark background.

      Best gas boiler brands

      Boilers
    16. 19 Oct
      Modern kitchen with dark and white cabinetry, a minimalist island, and a wall-mounted boiler, featuring stylish decor.

      Ariston boilers review

      Boilers
    17. 19 Oct
      Modern laundry room with green walls, white cabinetry, washing machine, open shelves, and neatly arranged storage baskets.

      Worcester Bosch boilers review

      Boilers
    18. 19 Oct
      White rectangular beverage dispenser with a spout at the bottom and a flat top. Simple and modern design.

      Vokera boilers review

      Boilers
    19. 19 Oct
      Compact white wall-mounted boiler with a black control panel at the bottom, featuring simple button interface.

      Viessmann boilers review

      Boilers
    20. 19 Oct
      Vaillant heating unit with control panel displaying digital settings, featuring a sleek white design and the Vaillant logo.

      Vaillant boilers review

      Boilers