I've been searching for a suppler of xray film in the UK and have come up with these guys... www.veterinaryxrays.co.uk

Or more specifically...

http://www.veterinaryxrays.co.uk/xra...emistry/film-0

They don't have an online store, but if you contact them via email they'll get back to you with prices / ordering info. When I last looked into this they were offering 100 sheet boxes of 18x24cm for 47.50 (ex VAT, I think...), although that was back in April, so their prices may have changed.

Hope that helps!
Tom.