I've just used the Homecert team (0207 205 2255) to carry out electrical and gas certificate tests on a house I want to buy in the Denmark Hill area. They were great, responded really quickly to the contact request from their website and were available to visit the house on short notice. The person I dealt with was helpful over texts, kept me updated and provided an initial view of the problems and I was happy with the advice provided. The test certificates and a quote for the work then came through quickly over email. I will definitely book in with these guys again.