Joe repaired the leak. He thought I needed a part for my Baxi boiler, however the supplier sent the wrong part but luckily he was able to clean up the old part and got the boiler working.
I had to call him back again as the boiler stopped working but he attended promptly and his bill for getting the boiler working was only £100.
I will be using Joe in the future to do my service and gas safety certificate.
Very pleasant guy, says what he is doing and is helpful all along the way.
Strongly recommend.