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Lost count of the amount of times that I have seen copper pipes that have leaked buried in concrete.

Establish exactly which joint /part is leaking ,and replace it.

You have a leak , probably on a hot water branch .fit a bung in the loft tanks outlet that feeds the hot water cylinder. See if loft tank water level stops falling . As you can't see any visible signs of leakage it's highly likely the leaking pipe is buried in concrete.

Do you have any toilets that are fed from the loft cistern , it's odd that only one cold tap is fed from it ? Are the pipes under floor boards in a void ( crawl space in ground floor )?

If you close off the supply to the cold water cistern after it is full of water, and don't use any hot water or any cold outlets that are fed from it ,how long does it take for the water level to drop ? Are there any hot water pipes buried in concrete or in a void under ground floor?

Ah ,it's not quite the same as the ones I worked on. There was no solenoid valves ,just a cistern at the top with float valve and overflow . Immersion heater and stat fitted at the bottom vertically.

Haven't worked on that particular model ,but have worked on a couple of it's predecessors. The hot water distribution is gravity fed,so needs to be fitted much higher than any tap outlets it feeds.

You would of course in summer months set programmer for hot water only, and leave central heating side off.

You won't get domestic hot water if only the central heating is running, if that's what you are expecting. What programmer do you have ?

Have you successfully fitted the new light ?

Ok the lamp worked with one red wire and one black wire connected to it. Which it would do if the red wire was live and the black neutral.

But how did you use the bedside lamp to establish a black wire was the switched live ?

So your pictured light fitting is not the one you are going to fit ? I don't really follow your info re the bedside lamp being used to establish the switched live is black ?? I suspect the 2 black wires are neutrals and the red wire is the switched live,but you would need testing equipment to...

Where are the" 2 small ten centimetres long wires" ,and what were they connected to ? Where is the second black wire connected ?

If the hot and cold are both under mains pressure 15mm should be fine for utility room.

Full bore are essentially used on low pressure/ gravity fed systems to increase the flow to taps/ showers etc. Choose pegler ,they are more reliable than any other brand in my opinion.

When cistern is filled ,does water reach the overflow tube and run down it into the pan ? If it doesn't ,then water is leaking past the flush valve seal and needs replacing. The float valve needs replacing too probably.

What's a Bot Harry ?

Looks like there is a fibre washer that's failed ,in between the tap and the wall plate. Taking the joint apart and resealing the threaded joint with PTFE tape should sort out the leak.