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Does the boiler actually work for central heating and domestic hot water,or is it going to lockout ?

Very unlikely that a replacement boiler is needed , replacement PRV is very likely ,the EV may just need recharging or at worst replacing.

Get a proper GSR engineer to investigate , the plumber is out of his depth.

Did the plumber at any time remove the front cover from the boiler ?

Further investigation required to determine if the EV is actually functioning as it should. What tests were carried out on the PRV ,if any ?

What does the boilers pressure rise to when heating is in use ? A filling loop that doesn't close would cause the pressure to increase . The pressure loss is likely to be unrelated.

If the system works ,what exactly are you worried about ?

Virtually all are 1/2 inch BSP thread. Prestex fittings historically used a different thread ,not sure about now.

It must be near there or it wouldn't leak there.

The silver hook connects to the little black lever above it. The toilet can't flush without it connected ?? The float valve that controls the water flow into the cistern needs servicing ,or replacing in my opinion. Does water continue to drip INTO the cistern from that valve ?

Reducing the waste water pipes length would be the obvious thing to do. Is there a reason why you can't do that ?

Yes it's safe to have 2 live wires in the same terminal in the ceiling rose.

Is the " hot water loop" connected to a central heating system with a hot water cylinder ? If so, running hot water taps is irrelevant. You need to drain the system at least to a point lower than the radiator you are working on.

You could fill the whole room with rockwool ,how is that going to result in water coming out the taps hotter than the " lukewarm" that you currently told us about ? The boilers pressure gauge has nothing whatsoever to do with the domestic hot water. It indicates the pressure in the sealed...

Are you referring to static or dynamic pressure,when quoting 1.5 to 2.5 bar ? And how / where are you measuring it ? As said already ,you need to establish why your boiler is only providing lukewarm hot water to the bath taps, that has nothing to do with copper or plastic pipes being used.

Changing the pipework diameter to 22mm will have no effect whatsoever on the hot water pressure. At the length of 15metres that you told us ,that would leave a larger volume of water cooling in the 22 mm pipework,than there currently would be in the 15mm, all of which would need to be displaced...

Why are you changing the hot water pipe from 15mm to 22mm , it sounds like you have a combi boiler,is that so ?

Yes,they do .

If the boiler is fed from a small tank ( usually in the loft), there will not be a pressure gauge

Can you show us pictures of the vent pipe position over the loft tanks. Where is the hot water take off point to the shower pump from the hot water cylinder.