Having been stung by a number of websites claiming to put you in touch with "trusted tradesmen" and also being misled by astroturfing, I now will only accept personal recommendations from people I know and trust.
If you are looking for a plumber I would recommend Garry Johnson. I have used him on several occasions & he is a really good guy, always on time, knows what he is doing & explains everything, leaves my property clean & tidy (sometimes better than when he arrives) hehe. I couldn't recommend him highly enough.
GPJ Plumbing & Heating - Garry 07882642799