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I can't judge the cable condition from the photo, but it's MICC / pyro cable which can run at significantly higher currents for the conductor size compared to PVC insulated cable, provided the terminals can take the higher temperature. If you can find an electrician with imperial MICC tools...

You can if you make it up with modular plates eg https://www.socketsandswitches.com/index.asp?SKSID=840&ItemID=33596 https://www.socketsandswitches.com/index.asp?SKSID=840&ItemID=17394 and any switches or blanking plates needed Not sure if there's a flex outlet module available.

RCDs require a balance in currents between the live and neutral. There will also usually be a slight leakage to earth because the neutral and earth are connected together. If the neutral gets disconnected the imbalance may briefly exceed the trip rating of the RCD - because more current goes via...

The 2-way switches are changeover. When the switch is 'off' L2 will be live, when the switch is 'on' L1 will be live.

You can avoid threading conduit if you use conlok fittings. More expensive than threaded but you won't be needing very many. An option that would allow flexibility and suit the building would probably be low-voltage tension wire systems.

The hose is usually a standard half-inch BSP, but the shape of the hose end varies slightly. The wall brackets etc are not standard and you will find that some permutations will fit and others won't.

MEM was probably added later for an electric shower. Someone doing a cheap job with whatever someone else was throwing out?

For really high-end, you need the transparent accessories which you can paint or paper below to match your specific shade of white.

We don't know whether your joists run left-right or front-back. If you're opening up the ceiling anyway just make a hole in the ceiling next to the joist and drill through, then make good.

The alternative is not to get a new supply and MPAN but to use a sub-metering solution such as Landlord Metering to split the existing supply to the two flats into separate sub-meters.

Offcut of plastic electric mini-trunking

The tank belongs to the current supplier, so you can't really do any work on it yourself. A new supplier might take on the tank once it's empty, and then move it before refilling it?

Now test the resistance of L to N, and (L and N joined together) to Earth.

I'd be surprised if they can't also record maximum demand (which is routinely surcharged on industrial installations) and so people could pay more for all consumption over about 3kW. This would mostly be heating and car charging anyway.

No. You can test for continuity to earth with a tester and a long lead, but in most cases with flush metal boxes you will have an adequate earth contact through the fixing screws, especially if there is one fixed and one adjustable lug on the back box - and at least adequate enough for a...

70% reflection is pretty severe. I've got 20-25% silver reflective film on a south facing window and it's reasonably effective at cutting glare and the 'sitting in hot sun' effect; not sure about how much it controls solar heat gain generally. The dullness looking out is most noticeable on...

I can't quite see from the photo, and it's not the same circuit board as the one at IntercomsRUs, but behind the cable is there a small rotary control? That may adjust the sounder volume.

Agreed. It also gives a better impression having permanent lighting, which directly or indirectly translates into higher rent and happier tenants.

Well I hope so, as otherwise those busbar terminals need more than a little attention!

https://www.engineshed.scot/ The Engine Shed is Scotland’s dedicated building conservation centre. Part of Historic Environment Scotland, it serves as a central hub for building and conservation professionals and the general public. Free admission in normal times.