Live in South London but bought my IS200 from Leicester...
Have to say the service was excellent and i'll be speaking to them again when I come to change (could be sooner once ive had a drive of the 20 Sport!!!)
Lexus in Croydon was a bit crap though...
Personally I believe its all about the single sales person who deals with you, those that take pride in the work etc always come out on top, and you can receive crap service from another person in the same dealers...