Try Ed Gravett. Use the tag added under your post for reviews and contact info.
agree with this - Ed did ours (and a few other bits and bobs). excellent service, and inexpensive.
Had Rodene Pollock of RJP Electrician in to do this precise job a couple of weeks ago. Would highly recommend him and his colleague. Well priced, unfailingly polite, did a great job of cleaning up, and checked back in the next day to make sure all was working as it should. 07956372227.