Just seen the thread about the stuck isolation valve. I was discussing similar with my brother on a Zoom call this morning.
Would it be possible to install a motorised stopcock to allow the water to be turned off quickly without having to go looking for the stopcock, which could be located in an inconvenient place? My brother thought this could be a problem in a power cut but I am assuming that having issues with water and electricity at the same time would be a remote possibility (but there would need to be a manual method as well).