Almost half the population have paid a fee or charge on a financial product or service in the last year, and two thirds think that companies use separate fees or charges to trick us into thinking that the cost is cheaper than it is.
These findings are backed-up by our car insurance investigation which finds that fees have been on the rise while premiums have been falling.
Insurance fees rise while premiums fall
Nearly half of the 28 car insurance providers we looked at have increased administration or cancellation fees since our previous survey three years ago, increasing by as much as 200% in one case.
We found Endsleigh's cancellation charge has tripled to £75, a huge 200% increase, while Churchill and Privilege have doubled theirs.
Six companies: Churchill, LV, More Than, Nationwide, Privilege and Saga - have increased fees to make changes to a policy by at least half, such as getting married, changing job or moving home.
Fed up with fees
Our executive director, Richard Lloyd said: 'Consumers are fed up with being hit with unexpected, additional costs for financial products that lead to them paying more than they bargained for. These fees can be hard to avoid, and people often don't know what they're really paying for.'
We want the financial services industry to Stop Sneaky Fees and Charges, and put an end to excessive, unclear and hard to compare fees that do nothing to improve the low level of trust in these markets. You can help by signing our petition and sharing this campaign with your friends and family.
Payday lenders have refused to act following our legal letters to reduce their default fees. We're now calling on the financial regulator to intervene.
We're calling on the Financial Conduct Authority (FCA) to get tough with the payday lenders we believe are charging excessive fees for late payments. We wrote to the lenders in January 2014 but have received no commitment for action from the lenders themselves.
Which? executive director, Richard Lloyd, said: 'It's outrageous that lenders are charging excessive fees which tip people into further debt.'
Drivers are being stung with a range of additional fees when they come to renew their car insurance or even to change details on their policies, according to new Which? research.
We looked at the additional charges levied by 37 car insurance providers and found that some punish loyal customers, or put you out of pocket if you move house, change car or get married.
Of the policies we analysed, you'll be likely to have to pay £19 on average if you need to change some details on your policy. Just over 20% of the insurers we looked at, including AXA and Swiftcover, let you do this for free.