ProDave

Can someone explain what this Section 37 is? I can't see why the DNO won't just upgrade their network and quote for the work needed. It almost sounds to me like there is a party being uncooperative and not allowing them access to something and they are having to force it through some legal process?

That definitely won't just paint over. As above the ceiling board in the alcove has sagged and all the joints are shot. A lot more work than a bit of filler and paint.

Not seeing picture

So most likely the neutral fault occurred and rather than any proper testing it was assumed it was the light fitting so you tried a new one?

If what you think is N, lights up a neon screwdriver, then it is most certainly NOT connected to neutral. So you have a wiring fault somewhere. Did the old light work before you removed it? Not sure we have had a straight answer to that one. Tread carefully, a floating neutral can be a dangerous fault to find and dangerous because unexpected things can become live.

That ship has sailed for me.

But the old light MUST have had neutral to it, so I still don't see why you cannot connect the same L, N, E that previously went to the old light, to this new one. As already mentioned you will have to leave the switch in the house turned on all the time for it to operate automatically at night. Post pictures of the actual cable you have coming from the house and how you have actually connected it to the light.

So it is a simple L,N,E connection no need for any switched L. So it should just connect in place of the old lamp.

Post a picture of your connections at the light fitting, that should clear this up.

30 years ago on a camping trip the camp site facilities were in a VERY old static caravan that was on the verge of collapse. The floor sloped a great deal so the shower tray was up on bricks at one end to keep it something close to level. This one would have been luxury by comparison.

He probably fitted his own JB's as some of the junction boxes built into light fittings are dire and impossible to connect 2 cables to (loop in and out to next fitting)

Yes picture may help. NEVER fit downlighters where you cannot change the lamp, and stick with 240V lamps e.g. GU10. If you ignore that advice and fit downlighters with a fixed lamp, buy PLENTY of spares, so when they go wrong in 5 years time and they are no longer available, you at least have some spares to keep you going.

This looks like your fill loop. If that is a pressure gauge there, open the two black valves at the end of the silver hose looking thing until the gauge reads about 1.5 bar then close them. Then try resetting the fault on the HP control panel

Your system has lost it's water pressure. One of the plumbers will be along to tell you how to top it up. In the mean time post as much as you can of the plumbing around the system particularly anything with something resembling a valve etc.

Don't do that. Post a picture of the insides of your fan and I am 99.9% certain you can just remove the timer module and your fan will work as a normal fan.