Decent auto electrician - St Neots area

[Zippee]

Following this thread - http://www.pistonheads.com/gassing/topic.asp?h=0&a... - I'm after a recommendation for a decent auto electrician that can diagnose and fix my central locking issue. I'm loath to take it to a BMW specialist as from some basic internet research a new BMW part fix can go well into 4 figures, I'm hoping a decent sparky type can actually fix the problem without replacing everything.