Max Wollen from Horizon plumbing and heating
0208 914 7943.
Max is qualified and Gas safe registered, I called Gas safe and verified everything was legit before using him, as I had a bad experience prior to hiring Max.
I would recommend John Lombard (aka J&S Property Services)
07800678902 or firstname.lastname@example.org. He has been doing central heating servicing and maintenance for me for years now, his team always do an excellent job.