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I guess not, but I assume it was there for a reason in the first place?

The old pipes were under the floorboards, wrapped in a kind of 'wool felt' and loosely/partially buried in a fairly crumbly brittle 'concrete' (for want of a better word), which chiselled away easily with an SDS drill. Now I've laid the new pipes I need to replace the concrete. Any idea what it...

It appears to be required under BS7671?

That sounds like a good idea, although clearly a lot more work because of moving the cables etc. What about the risk of people touching it with wet hands if they have to shut off the switch in an emergency?

Are you sure it's not a legal requirement? Even for a let property?

I've replaced the switch 4 times. I've ordered a crabtree now.

I think it's 9 but I'd have to go to the house and check. I'm also not sure if he switches it on everytime either. I asked him not to, but that doesn't mean anything!

Thank you everyone. This forum is the absolute most helpful place on the Internet!

My wife's tenant has a recurring problem with the ceiling mounted shower isolator switch burning out. This must be number 4 in the last year and as I'm cutting off the burnt ends of the cable each time that I replace the switch there isn't much spare cable left for me to cut off! For clarity...

Cheers.

So one of these?: https://www.screwfix.com/p/single-check-valve-22mm/61237

Thank you all!

Yeah, what are the chances of that???? So where is it 'most likely' to be located?

If this valve was present where would it normally be situated? If it wasn't present, would fitting one be a better bet than fitting a motorised valve next to the pump?

Cheers!

Many thanks.

Thank you very, very much for taking the time to help me with this. Whilst I have your attention do you have any thoughts on a good location for a magnaclean, given the space constraints around the boiler? Does it have to be located right near the boiler?

OK thank you for clearing that up. Is there any reason not to fit a valve BETWEEN the boiler outlet and the pump, as that's the only bit of pipework I can access (see pic). From the pump outlet the pipe runs behind the boiler and into the wall and there's no room to even get a cutter or...

My god I'm blind as a bat. So sorry. How does putting a valve in there stop the upstairs rads heating up when the HW is on? To clarify there are no TRVs on ANY of the rads! Or are only the upstairs rads heating up because some sort of thermosiphon effect?

That's excellent information, thank you!