As you are in Berkshire, you are far better off to get Jez at Horsham Developments to check your car out and do any alignment.
http://www.h-dev.co.uk/index2.php?page=home
Just anxious for you, having followed this thread, you don't go and waste money with somewhere that dosen't know what it is doing and what the likely issue(s) are to be causing your problem.