I would look into the legalities of it. )*)&
Just found this:
Which? launches super complaint about credit card feesMarch 31, 2011
By Rachel Constantine
Consumer charity Which? has this week submitted a super complaint to the Office of Fair Trading, calling for an investigation into “excessive” charges levied on credit card and debit card payments.
Which? has argued that the charges are unjustified and warned that more and more organisations are using them. It says that while each debit card transaction costs organisations no more than 20p and credit card transactions cost them less than two per cent of the full purchase amount, many are levying much higher fees.
It cites examples such as some companies charging flat rates of £5.95 and more to customers using a credit card, whilst one letting firm is accused of levying a £25 charge on a £5,000 flat deposit. Some London taxi companies are said to be adding a 12.5 per cent fee on top of the taxi fare for those paying by card.
Which? chief executive Peter Vicary-Smith said, “Consumers are really fed up with paying excessive card charges. So far, over 40,000 people have pledged their support for our campaign to bring these to an end. Low-cost airlines are some of the worst offenders, but excessive card surcharges are becoming ever more widespread, with everyone from cinemas and cabs to hotels and even some local authorities getting in on the act.”