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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.
For some the grant means it’s not expensive. For big drafty poorly built homes it is not cheap, those kind of places are expensive to make efficient and expensive to heat whatever the type of fuel.