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Something like this? So there's no access under the bath once is set down, so the waste has to be connected to the bath then it's set down onto the floor, hence wanting to use a flexi connection onto the bath waste ? Is there any room for a trap under the bath as that's usually an issue with...

Is it a free standing bath that has a skirt all the way to the floor?

As far as the regs are concerned, a waste pipe discharging into a gully should discharge below the grate level but above the seal but can only be used for grey water if the gulley is connected to a combined drain/sewer Hence why most plastic gulley grates have waste/down pipe cutouts

The key is if it is solvent Weld (ABS/PVC). If it is then I have got away with a piece of 40mm cut lengthways before. That then has a sliver cut out of it lengthways so it will shrink enough to use as an internal liner, glue down the cut and then glue a new piece of 40mm over the top. All cuts...

None at all, that I can see.

I would also suggest all the pipework has a high quality, high rated insulation fitted too, if it hasn't already.

https://www.diy.com/departments/mdpe-fittings-to-copper-pipe-connectors-20mm-straight-22mm-copper-/5060449709440_BQ.prd Basically a 20mm MDPE to 3/4" female with a 3/4" male to 22mm compression

The mini receiver is wired the same way. Power is connected from L and N (Brown and Blue), switching is performed by Grey and Black for a combi. The Mini itself is wireless and battery powered.

Yes your local friendly GSR engineer should be able to remove it and do it with the right chemicals

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Is it a sealed system or is it open vent and supplied from a cistern in the loft?

Unfortunately the mains booster pumps are all pretty similar and cheapest is around £250 and as suggested, mains cannot be pumped more than 12L/Min.

TBH a boiler can sometimes be only as good as the installer. Most modern boilers will run happily, without issues, if they are installed properly, looked after regularly and are connected to a system that is in good condition, maintained properly, setup properly and run correctly. Trouble is...

Nope

Absolutely, warm it up, or bend it opposite to itself and it will straighten up, should be more then enough to get the insulation around it

That silver ISO looks like it's on a Tee up to the other pipe? Not sure from the photo so unsure what it may isolate or if it's some kind of bypass if it's connects into the pipe above. Not sure about the remote sensing head either, all depends on whether it works or not really and if the...

Sounds like an airlock TBH

You can get specific insulated ducts for every size of MDPE. Shallowduct is the one I used to use for 25/30mm MDPE, from the same people that produce the Insuduct. Not sure what you mean, MDPE is relatively flexible?? It comes in loops?

That's a contact temp sensing head - not a TRV (thermostatic radiator valve) though they do work in the same way. The vial sits inside the pocket at the top of the pump to maintain set flow temps. Obviously the valve itself is damaged and needs replaced. Yes the system will need isolated and...

Water sealing what? Neither of them are a standard silicone which would be used for standard sealing, like baths, showers etc, they are a silicone polymer adhesive which is quite different stuff.