Rollo, check on alignmycar.com (or google it).
Will show you your nearest center. I used one in mansfield (not sure how close it is to you?)
Both the guys there are top lads. Use a hawkeye system which is mm perfect. Don't question what you want doing and advise you aswell.
I went to one place and asked for +/-2 deg camber and they said no way... The guys dont mind you getting stuck in either and explaining it to you... Cost me £45 for a full set up + a brew!. Would highly reccomend them. Chris (480bhp) gets all his cars set up there too..
Also Dave, I dont know why they told you your car would handle worse as mine was understeering quiet bad, but Chris advised me to raise the rear a couple of MM and the problem was solved. Very odd.