I've just bought this although I have not tried it yet.
http://www.mr-fastner.com/proddetail.asp?prod=MRF9PPK
Also a dremmel is a very handy tool to have.
What mods have you got planned?
I have used TDI North in the past,they are based in Warrington.They don't do the uprev re-mapping though,i used Paul at RS tuning for that in Leeds.