If you are going to race it then you can buy wets trackside at a meet.
Which club were you intending to race with?
Both these attend BEMSEE and MRO meets:-
http://www.arracing.co.uk/anr.nsf/vi...cat=Race+Tyres
http://www.rodharwin.co.uk/products.php
A&R support NG too (mibbie others, dunno??).
If you have never used wets, then any make will be awesome, but my personal preference is the Dunlops (have them as my WoW), but it is a personal preference thing ...