Thank you to everyone who has replied and I apologise for not responding earlier. Ryanairs policy is that you can only print boarding cards outward or return 15 days in advance, therefore for those travelling for more than a fortnight it is not feasible. After I contacted Ryanair, they advised that it was possible to print out at the airport for ?42!!!!
The annoying thing is that they took the booking without advising this and charged for airport check in - only 2 days before announcing their new policy, this in itself cost my in laws an extra ?20 which they won't get back.
Anyway thank you very much Poole Pirate for your kind gesture, I knew we could rely on the LG hospitality. As my in laws are at Tamara, I am sure that they will have a wander down to the marina for assistance and put a few extra euros in Dollys collection box over Xmas.
Many thanks again and I hope you are all well