Home ownership is a form of death by a thousand cuts (or maybe poverty by a thousand cuts). As GF was switching off the light last night he saw a small bulge in the bedroom ceiling. It had not started to rain yet, so the implication was a leak from within the fabric of the house.
Today it has got worse and the ceiling is beginning to bow. GF has investigated. It seems that there's long term seepage from the tank. This has now gone critical and water has started to accumulate. GF has tried to plug the leak, but at best has slowed it down. He has punctured the ceiling to allow the water to drain away... but fears this is a big job. he has spoken to Medallion Man who will take a look tomorrow.

[File under: DIY]