There are various places to buy them, I've just had one made up by a fourm member from another fourm. Its unlikely that anyone will make you a loom. There is a RR somewhere in the south that maps them but its not generally liked as its meant to be DIY. Still worth calling your local tuner and seeing what they say to it.

http://www.extraefi.co.uk/

http://www.mtechautomotive.co.uk/

hth
JAmes.