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Toilet overflow. Often not used these days as new toilets have internal overflow.

They should have a Photo ID Card with details of G3 Course and Expiry date

This is some 'Hunter' pipe [if I recall correctly]. Very brittle stuff, I would avoid it at all costs. I have suggested to several customers it was all taken out and replaced with copper. In 1970's there was a copper shortage after a trade embargo on Rhodesia so other materials had to be found...

New one on me today. Heatslave 20/25 locking out. Changed nozzle, checked oil pressure and it ran ok. Left to run for a few mins and then disconnected my oil pressure gauge. Boiler then wouldn't fire and went to lockout after 12 seconds but with no obvious sound of ignition. Decided to check for...

CT1 will be your friend here. I temporarily repaired a pin hole in a copper cylinder with it. After replacing the cylinder I couldn't get the CT1 off to look at the hole.

Use a BRASS tap, 25mm with insert striaght to 15mm or 22mm copper. https://www.screwfix.com/p/poly-stop-cock-25mm-x-15mm/86048

Honeywell Valves for me

I use Heldite jointing paste too, as recommended by OFTEC.

Your boiler has a frost stat which fires the burner if the temp inside the boiler casing gets below about 5°C. To stop if firing for long periods, a low-limit stat can be fitted to the return pipework in the boiler, so that when the return temp reaches 30°C it will turn the burner off.

Flow switch could be sticking in the 'ON' position

A new filling loop shouldn't take too long to fit and no qualifications needed. Make sure double check valve end is on the cold water supply end, drop pressure off the system and you can check for any back flow of heating water by putting the old filling loop end over a bucket. Filling loops...

Every Unvented Cylinder I have fitted comes with its own 2 port valve.

I bought the Wolseley Hot Box as a back up to my two torches. It comes with a "Cool Tip"... that remains cold when torch is in use.

Do you have a FROST STAT on your system?

One-piece if two pieces less to lose than three-piece.

I would smear clear silicone sealant around the entire cut surface of the sink cut-out. Let it dry before putting the sink in otherwise it can get a bit messy.

Surely your outlet should be connected to a wall-plate elbow that firmly holds the tap in place. Those clips will never hold the tap still.

I would not use speedfit in my own home let alone bury it in a wall.

Would a 25mm to 15mm or 22mm stop tap not be a better bet if you can cut an access panel in the floor?