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Would likely cost the same either way. You either need to pay them for one visit to do all the work, or two visits - one to do the flue, gas, and hanging the boiler on the wall, and one to do the commissioning

It's possible. Was the flooring rated for use with UFH? What's the flow temperature? Are there any floor temperature sensors installed with the thermostats to limit surface temperature?

No. The output of boiler you require is related to the heat loss of your home, not the type of system it is connected to. Get a full heat loss calculation done and go from there. And yes, a 30kW Intergas can be range rated at max per but the minimum output (which is where you get your...

Neither of those points are relevant to boiler sizing. A proper heat loss calculation needs to be carried out on your home and that will inform the boiler size required. You almost certainly don't need 30kW

There's the potential for legionella and other bacteria to build up in the cylinders that are isolated. They'd need thoroughly flushing and treating prior to bringing them back online

Definitely not, it should be flushed out

Make & model of boiler would help

Pumps are easy to remove

Don't be rushed into anything, yes you want it doing reasonably soon but the weather isn't so cold now that you can't survive without heating for a few weeks, and presumably you have an immersion heater in your cylinder for hot water. Do you actually want a combi or is that just what's being...

No that's the grab ring and it will sit proud like that. Perfectly normal

Ground Source Heat Pump

Sounds like an expansion vessel problem

Can't go too far wrong with a Vokera Vibe Max https://www.toolstation.com/vokera-vibe-max-combi-boiler/p27309

Given that this thread is over 18 months old, I would expect they've had it done by now

The ecoTEC plus is an excellent boiler, superior to the WB 4000 IMHO, the ecoFIT pure...isn't. Both work best & most efficiently with the manufacturers own controls rather than third party, but they do add significantly to the cost.

Which Vaillant system boiler? ecoFIT Pure or ecoTEC Plus? Do you actually need 24kW - has a heat loss calculation been carried out by either firm? What controls are they proposing to fit? Will the integral diverter valve be fitted on the Worcester if you choose that option? The quality of the...

Just change the valve, much simpler

Salamander are pony. Get a Stuart Turner Monsoon Universal

Standard domestic gas meters are limited to 65kW total, so you need to be sure you're below that

Can you post photos of your programmer and airing cupboard please? £50/w is a huge amount of gas, even on a prepayment meter. I'd be looking into where that's going.