As I write, the temperature's dropping and the heating's dead. It's really all my fault. My 12 year old range cooker was feeling it's age but still soldiering on, until an oven element went. A new one was £26 and I could have fitted it by removing the oven door and removing a panel. Instead I stupidly opted to replace it with a new cooker. Oh, regrets. You see, not wanting to risk the validity of insurance policies or anything else I called in a Gas Safe bod to make the mechanical gas connection - a simple 1/2" BSP fitting - and you can guess the rest. At the testing stage, he found a minor drop in pressure at the boiler (within acceptable limits), started poking about with the boiler and found something else - an incorrectly routed pressure relief valve. Formal caution issued for boiler. Then re-testing pressure drop, he found a 1/2 millibar pressure drop on the pipework from the meter. You're allowed a 4 millibar drop with appliances connected - but zero with appliances capped. Another caution, meter capped off. So I now have to put my hands in my pocket for a horrid new condensing boiler and a replacement supply pipe.
Words cannot describe my frustration. So, reader, if anything goes wrong with your gas cooker rebuild it in-situ, every single part if necessary, except the one single gas connection that must be preserved intact at all costs to keep the installation valid. The entire gas related industry is just one huge mutually beneficial con, a scam that even I have fallen victim to.