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Fox-
Really slow response if set in dry screed, compromised performance if retrofit overlay/between joists. Ideally you want decent response time to achieve an overnight setback temp and recovery; I know I find a 21deg bedroom uncomfortable to sleep in.
Also poor ratio of emitter surface to room volume; bedrooms usually have a lot of furniture about the place, including a bed taking up a big chunk of floor.
ectoplasmosis
Please don’t do this, you’ll have a really bad time.
Leccy UFH is unbelievably juicy, especially retrofitted to a suspended/poorly insulated slab floor; your 20kWh of batteries won’t touch the sides.
UFH in bedrooms is also a bad idea for comfort, for many reasons.
Get one of the big energy companies to install a heat pump and massive radiators; you prob know this already but the £7.5K grant makes it cheaper than a boiler install. Don’t waste your money on unnecessary UFH, and certainly not electric UFH!