I and a fair few others run 012ss's, mine have been used for track days (wet & dry), normal road riding and 10 days last summer in the Pyrenees, absolutely faultless mate ....
They may not be quite as sticky as the Rennsports but they also dont put you into a panic at the first sign of a drizzle ... and beaing in mind outr climate, that gives them the edge ...
Watling Tyres supplied my last rear (Friday) in Catford, about 30 minutes from the West End althouh they might have one more local ..
www.watlingtyres.co.uk the club favorite is Steve at Wraysbury but I suspect Chertsey may be a little far for you ...
Hope that helps mate