I'd like to recommend Robert Mills of All Aspects Plumbing. He's just done a new boiler installation for me and was very friendly, professional, well-priced and considerate. There were a couple of tricky issues with the job, which Robert was kind enough to take extra time over to ensure everything was working to its optimum. His number is - 07952 584171
A further recommendation for Patryk's work - he's just completed a patio job for me. Excellent finish, decent price, quick job, clean and tidy, good communication. Will be going to him as first port of call for future work.