If your planning on making the trip to Kidderminster then what better meeting to go to than this
http://www.oople.com/forums/showthread.php?t=85131
Whilst the comments about Ledbury being a valuable testing place also then I could not agree more but there is a basic rule of thumb I follow "It's easier to tune grip out than to magic some out of nowhere" hence I prefer to do my initial testing on a lower and / or varied grip surface like Kidderminster.
Once you have a car that works at a place like Kidderminster it will work everywhere with just a minimal amount of tuning!
I really hope to get over to Ledbury for some of their other winter series rounds, especialyl as the track is insanely high grip even when soaking wet!
Who ever said Ledbury is bumpy needs to go to a few other places (Hinckley springs immediately to mind) as I can tell you as far as my big bore equiped Lazer is concerned Ledbury might as well be a bowling green
Hope to make it back to club in the next couple of weeks, time is sadly my enemy at the moment