Try Phil Corley cycles in Milton Keynes. They are a Spesh dealer and may have a secret stash of bits off broken frames. Noel in the workshop is best bet.
Cheers nick, i was told that else where, but i'm not the original owner so i'm out of luck there?
Try them anyway, just drop them an email customerservice@specializeduk.com I got a new arm for my chicanes (free of charge) and they never asked for reciepts/proof of purchase etc.