There are laws in the UK to prevent "unreasonable" penalties in a contract. The UK banks know all too well about this when they were pulled up for charging 40+ quid for a letter. So my advice would be to explore this avenue. I am assuming UK law applies, which may not be correct.
Ryanair is an Irish company with it's HQ in Ireland and the "unreasonable" request to print off your own boarding pass or pay through the nose for it being printed off at the airport by Ryanair has already been challenged in Spanish courts where Ryanair "won" at the end of last year when they appealed an earlier decision where it was declared to be "abusive" as it had been "the customary practice over the years has been that the obligation to provide the boarding pass has always fallen on the airline". Unfortunately, "customary" is not necessarily "law" so, according to the appeal judge, surcharges for not printing off your own boarding pass are in compliance with international law and Ryanair were able to keep said clause in their T&C's.
Any attempt to challenge things in the UK would probably also fail, since we are looking at it being classed as being under Irish law, so if you don't like the potential surcharges the, don't fly O'LearyAir.