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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

Best thing if you don't know anyone is to go into your nearest "independent" trade merchants and ask them to recommend someone.

I'd be using the magnets to catch as much as possible and then dumping the water down the loo, not the sink.

Purging flow and return into a bucket /hose while rad is off will reveal a lot.

If the top pipe (where there is a new tee off) is the cold mains to the water softener, and that new tee feeds cold mains to the boiler, then this branch is not softened, meaning that your hot water is not softened. It needs to be determined if the combi allows the use of softened water for...

Care to include the 12 defects? Be interested to know.

If the pipework is furred up/blocked then that needs either flushing or repiping! Did it work well before? What boiler was replaced? Was it also a combi? Was the system open vent and sealed up?

Imagine kids at school using it these days! They'd have no gender to change!!

Try submersing it in mild detergent and warm water first. Then a good spray with wd40 or gt85 or silicone spray.

Needs a key to go in the 3 slots. Be surprised if you can service it tbh. Maybe if nothing is broken and you have patience but it depends if it has innards that are not pressed in with barbs etc.

Why short notice? Can you not get the engineer who previously gave you paperwork to come back and do it again? That would seem the path of least resistance! Is it for warranty? Insurance? Edit: just seen it's for insurance - as @HERTS P&D is it a rental?

Independent service engineer or operative(s) from a pay monthly cover provider?

Try the one in the loft (bag taped over it will do.

Is the boiler still under warranty?

Yep.