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Only if a hard water area. Can't be arsed to look up if it is... Scotland, no idea without looking.

BS 7593:2019

https://www.installeronline.co.uk/heating/top-bottom-opposite-ends-tboe-trv-installation-what-installers-need-to-know/

Have a chat with him. We all get stuff wrong sometimes. Valves may be bi-directional but radiators that are piped up TBOE are not! To the remote eye, it's fairly obvious what the elephant in the room is. For the sake of a couple hrs work change the boiler F&R round and see what the...

I'll fit one new but that's as far as I'll go!

TBOE

And yet sludge is the biggest cause of CH problems and boiler breakdowns. And is why the government have now introduced quality checks for system water as it also affects energy usage.

Ideally, but rarely done.

You don't need a product. You just connect the feed and vent to the pipe in an "H" configuration, the correct way around and the correct distance apart. 2 tees is all you really need... Use compression then you can always take it apart for future attention!

Discharge from unvented should point down to ground not out at the open world. Does the kit in the photo have a NRV in the clamp-on fitting? Where's the NRV?

I wouldn't worry too much about the cylinder not getting to 60°c.

I'd stick it through the wall and turned down to point at floor. Doesn't have to be trapped that way.

If it works as open vent, then add pipework with a fall on it... Enough to allow condensation (and rain ingress) to run back down to the stack. And yes, use the proper drainage flexi.

Is there an external wall behind the unit? If so, discharge the tundish to outside.

Try it first and see what happens. Only issue would be condensation if the flexi is fully supported, it should run back into the stack and not be an issue. All depends on results from leaving it as a svp.

Another option, if there's room on the shower waste pipe, would be to access it via the ceiling below and fit an inline hepvo (waterless trap fanny trap).

In-floor horizontal 4" runs are not ideal but sometimes you've got no choice. Is the whole stack internal or does it emerge from inside to outside at some point? With the bag on the aav in the loft... Keep flushing the toilet and see if it eventually pulls the shower trap... Run the basin...

EV might need pumping up too.

And that is such a common installer error! Glad you got it sorted and kudos to @CountryFan... Virtual pint on its way???

If you want to do it properly and have the time... A couple of temp clamps and adjust lockshield until getting the correct deltaT