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A problem that isn’t going to go away, having spent thousands on getting our flat insulated and with heat pump ready pipe work it’s unlikely permission would be granted to actually fit one.
Technically it’s not feasible either due to height/access.
Only option would be a block wide ground/source or some big unit on the roof which is never going to happen unless everyone agrees to the significant cost.
I guess the trouble is that a lot of none big drafty homes would then have trouble on where to locate the thing.
My place is too poorly insulated but, even if it wasn't, where to put a chunky heat pump would be a real issue.