As some will have noticed, Easyjet no longer charge an admin fee (was about £16) per booking
As far as I can recall, if one wanted to pay in a currency other than that of the originating airport (e.g. if you want to buy a ticket from Milan to Paris in GBP instead of EUR), then Easyjet used to apply interbank wholesale rates - and didn't charge a mark-up. It seems that Easyjet have changed the policy, and are now adopting that of Ryanair - i.e. charging extra (seems to be about 3.5 % commission) for paying in a currency other than the suggested one