Good morning, bright and cold. Waiting for the gas engineer. Went out shopping yesterday morning returned at 12.30 to a cold house. Turned the thermostat up, no response., ran the hot water tap, boiler fired up, hot water and cold radiators. Phoned BG, no appointments until this morning. Luckily we have an electric fire so that came out. At about 5.30pm I heard the boiler and the radiators were getting warm, all good since then. i haven't cancelled the engineer as something is obviously wrong, probably the thermostat. Got to have a reliable heating system for the winter.