Having been given a misleadingly high quote by another firm, who told me that I couldn't have a gas water heater in my small bathroom, Mr Parkin came along and made a professional assessment, and then gave me a reasonable quote (which he stuck to). He went to some trouble confirming that the new heater would fit the old flue (which would have otherwise involved scaffolding). He then dismounted the old leaking water heater without flooding the bathroom floor. He then carefully altered the existing copper pipework to fit the new boiler. He dealt with a leaking tap (not charged for), and checked for gas leaks (he found one - again not charged for). Also a very pleasant and interesting person to have around. He was in no hurry to present his final bill, which was exactly the sum quoted at the beginning. So very strongly recommended.