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+1 Gas PTFE - 7 turns - turned on opposite to the tapping thread so it doesn't unravel when tightening.

Your enclosure can be taken off and all the bad silicone cleaned off and then put back together and re-sealed. As suggested, a shower should be dried after use and cleaned regularly. That and a good quality anti mould silicone needs to be used.

The plastic shims are to stop the rad from rattling/clicking on the bracket. I would normally expect to find them. Yes the rad can be fitted without them, could it click without them, possibly.

get longer arms ;)

Wouldn't be the first time I've hole sawed through an I-Beam for pipework, good quality bi-metal hole saw with a good drill and lubrication will make short work of it. Just make sure the holes/pipe is protected against rubbing damage.

Who's to say it was a professional? Looking at the soldering he wasn't a very good plumber never mind a professional IMO. A lot of so called professionals just aren't and a lot aren't even qualified. That's the trouble with plumbing, no regulation and the industry has made it so easy, where...

I have yet to find any silicone that does not eventually go black, even the mould resistant ones, neutral or acetoxy. The trick is drying, don't let silicone stay wet, it can be as simple as that.

Programmer sends 240V to the cyl stat > cyl stat sends that 240V out to the 2 port > that 240V powers the 2 port valves motor that opens the valve > the microswitch in the 2port valve is triggered by the valve opening and sends 240v, that is running in on the grey wire, over to the orange wire...

Just ensure it's mould resistant sanitary silicone. I have used both and haven't noticed any difference but as suggested the neutral cure is more designed for plastics/acrylic. Good silicone is a practice thing TBH. You can help it by using masking tape and silicone finishing tools and the...

You would always want any AAV to be above the highest spillover level of the highest fixture it is connect to. Why I didn't suggest an Antivac bath trap. If the AAV is placed anywhere other than close to the bath trap, then shallow bath trap seal could still be pulled if the bath empties...

Looking at that pic the immersion isn't connected to anything. If it was there would be a live and neutral connected to the 2 top terminals on the left hand block.

Restricted plate heat exchanger most probably, could be cleaned and flushed. Goodness, haven't seen a Sabre in many years - Rebadged old Vokera Compact

An inline shower booster is small beer, nothing like a proper shower pump and it's really easily removed when leaving without any obvious signs apart from a small section of replacement pipe.

Be careful, if the HW 2 port is manually latched, there will be no HW temp control. The cylinder stat controls power from the programmer to energise the valve and then shut's it down when the it reaches set point. If the valve is manually open and the boiler is being controlled by the room...

The ribs in the rad have to be what will carry the water through internal waterways by the looks of it, no other way it could work. TBH though , cant say I've ever seen that actual type before.

When you can get a suitably sized 25gal coffin Cold water cistern for not much more than £100 then what the feck are they charging £900+ for?? All they would be doing is > isolate current > drain > disconnect > build up new > reconnect >check and test. Not a lot of time or effort in that. If...

You could get an M10/M12 blanking plug, tap tail size dependent, with a suitably sized O-Ring and use that

OK - certainly seems to be a secondary vent, to vent the basin/bath waste run and protect the traps. Cut the vent as it leaves the vertical stack and seal it up, then fit a McAlpine anti vac trap on the basin. Fill the bath right up and let it go and make sure it doesn't self syphon the bath...

'Oversizing' the system rads can allow the system to be run cooler, whilst still satisfying the rooms heat loss requirements, that obviously reduces energy costs with lower deltas and more consistent condensing and reduces the strain on the boiler. Its how low temp heat pump systems are...

An electric shower will not only require the install of the shower with it own dedicated cold water supply, it will also require it's own dedicated electrical supply, what cable size/MCB rating will be determined by how powerful the shower being installed is. That and if there is space in the CU...