Steven called me and advised what he thought the problem could be over the phone, he then arranged to come round and have a look which he did. He gave really good, clear information and answered any questions I had, he arranged another day to come back to service the boiler and hopefully this will be all that is required, If not then I will not hesitate to contact him to carry out any other work that is needed. He was polite, clean and tidy and it wasn't too much bother for him, I would recommend him to anyone that needs any heating or plumbing work as he was excellent.