In reply to FockeWulf:
Depends what you want. For a friendly british guide most of the cham based ones will be good. Kev Avery and Will Harris who post on here are both really nice guys and I'm sure if they were busy they would point you to other people they know who would make sure you have as enjoyable a a time as possible.
Think most will need a training climb with you beforehand though so factor that in.