Fixed the washing machine. Turns out that socks are not always your friends. One of them had managed to get inside the water outlet underneath the drum and blocked it. The reason that we had such poor drainage was that all our washing water was being “sock filtered for extra purity” before being sent into the drain.
Note: You are not allowed to steal this by-line and use it sell bottled water.
I’ve no idea how the sock managed to get there. And I’ve also no idea where the other one is. Perhaps it is up in the loft loosening my ball valves even as I write this.