I wouldn't mind but credit card is THE only way to pay to safeguard yourselves against cancellation
I'm sorry, but can you explain this to me. What exactly are your credit card company going to give you in the case of cancellation that the airline won't? If your flight is cancelled, the airline WILL refund you.
What else are you going to ask your credit card company to pay for?
Take my advice, book with your debit card!
£12.65 certainly sounds high but it means nothing without knowing what the total cost of your tickets were. CC commission is excluded from the advertised fare and I guess has to be passed on to the customer as yet another extra.
easyJet charge 1.95% or or a minimum of £4.95 for a credit card. The only exemptions are Carte Bleue and Visa Electron.
All other Debit cards (switch, Delta etc..) are subject to a fixed rate (£1.50 I think)