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especially the fact they're noisy
The noisy part is outside. There should be nothing but radiators and maybe a storage cylinder inside. Maybe you're thinking of the kind that transfer heat directly to the air and therefore have a fan indoors?
I think ASHPs are still in early adopter expensive-for-no-good-reason stage. I expect that to change though it may take a decade or two.
Hydrogen should be considered bollocks vaporware until proven otherwise. The boilers are the easy bit.
grams
I'm also buying a flat with a trashed gas combi boiler and have looked into it a bit, as I've really like to move away from gas too.
My understanding is that gas is still the most cost and energy efficient, but electric boilers may not be a lot more expensive for small flats. You might find that costing out the expected use scenarios might make electric attractive maybe?
I've disregarded air source heat pumps because everything I read about them is unconvincing or bad, especially the fact they're noisy. I would like to be wrong on that obviously.
One thing I'm interested in, is hydrogen ready gas boilers. Bosch have demonstrated that current gas boiler tech can be made hydrogen ready, but they're unlikely to be ready for a while, and then hydrogen will be a 5-10 years away on top, if at all.