Having just moved into East Dulwich, I used C&G Electrical Services to do a number of jobs updating the electrics. They've been recommended on this site before but I add my endorsement and would highly recommend them. Clive & his son are based locally in Nunhead Green, did a great job updating the fuseboard, RCDs, light pendants and replacing spotlights. Competitively priced, timely and great to deal with. Clive is on 07831 349332