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Incidentally, the pipe going to the shower from the pump (the cold, I presume) does in fact have an isolation valve on it. This doesn't make much sense to me and it makes me wonder whether whoever fitted the pump originally simply put the isolation valve on the wrong pipe by mistake.

Thanks for the explanation, makes sense now. No, the shower pump has worked absolutely fine until a few days ago when the problem suddenly appeared. As regards draining the loft tank, it appears to me that I have to run off all the hot water, which I would be sad to do as it's rather wasteful...

What would happen to a bit of loft insulation going down the pipe from the loft tank to the hot water cylinder? Is there likely to be a filter on the inlet to the cylinder? (And what function does that feed have, incidentally, as I would have assumed that the hot water cylinder would only be...

Sorry, one of the images is duplicated there. The one showing the pipe coming off horizontally is where the pipe to the shower pump branches off the main pipe from the header tank. The other two are joins further down (including another pipe going off somewhere else, not sure where), and the...

I have a Stuart Turner ShowerMate twin shower pump which has suddenly stopped working properly. It stops and starts and even when it's running the pressure is low. Because this happened a few days after I replaced a ball valve in the header tank in the loft, a process during which some debris...