DO NOT USE BRITISH GAS we have had the most awful experience with them. The most stressful 3 months and a total lack of empathy shown by their complaints department. The sold us a new water cylinder and boiler, told us it would take 2 days. What they actually did was fit 2 faulty, leaking cylinders, fitted faulty valves, wired the boiler incorrectly, wrote a gas safe certificate for a boiler which was not working, left us with a boilet that sounds like a ship coming into dock when you turn on a tap, spent 3 months sending multiple gas fitters into our home, wasted water, heating, created damage through leaks, lied about work being OK. When we complained, the customer complaints department replied with two sentence replies and decided that a reduction of 6% on the bill was all we needed. This has been a horrible experience. I still don't feel that my boiler is safe. All they care about is getting paid. Horrible horrible experience