a full VISA card booking has to be made using the same card at higher cost
This surely is RYR making sure they can cover costs such as departure tax when offering flights for £1, free etc. as has been the case recently.
Booked recently for a day out STN-DUB in Jan, and would have only paid £8 for 4 of us return, but £32 (£4 per pax per sector) was added as this supposed "credit card" charge.
So, £40 for a day trip to Eire is still cheap as chips, but it does rankle a bit that the good old "harps" have to disguise things in this way - I do of course understand they have to cover costs outside their control, so why not just be honest!