The honourable thing for your friend to do is to offer to pay his end of the deal. If he isnt preapred to pay what is a measly 50 pounds, then he isnt no friend. Ditch him. I once had a friend do the same thing to me, booked a flight then decided he didnt want to go. Luckily he had paid me for it already, but when he said he wasnt going, he asked me for his money back! ****! I said, "You think Ryanair does refunds?" LOL thankfully we were able to find a replacement for the hotel and had a better holiday with our replacement friend altogether!