Send an enquiry to http://www.processuk.net/ and ask, that's where I ordered my 50 rolls today. (I didn't order everything they had, those rolls surely will keep me supplied for a long time coming)

They also have it in http://www.ag-photographic.co.uk/fuj...-36-1069-p.asp , but based on the text there I am unsure on how much they have.

http://www.fujilab.co.uk also have it, even 1 cheaper than other places, but they don't ship outside the uk.