Two points to make here.
Worst case scenario; i.e. hardest way to lose; only thirty quid is taking 6 lots for half a tick on Eurodollar. This should not be a lot of money for you if you wish to self finance STIRS! Even spanish made a grand this week.
Secondly I have this book and am willing to give it up but not to sell it; instead is there anything interesting you can offer me for a swap instead?
For example: a canoe, a copy of that dennis guy's magazine that got him for obscenity, an eighth, some chilli sauce with a stupid scoville rating, a police master key, the inner workings of opus dei, a smartcard to the alternative exits at westminster tube...
If you have anything quite interesting private message me and I can send you the book.