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So when we do downstairs I am wondering the same thing - aesthetically we'd prefer smaller ones but if gas central heating is ultimately going to be done away with I don't want to have to rip up all our nice original restored floorboards to put in bigger rads...
FWIW the floor might have to come up anyway to fit larger diameter piping if you were to install a heat pump (which you probably won't, or at least, not on its own - on the assumption that your gaff is too inefficient at retaining heat to make one viable).
And then at that point you might be 'fuck it, it's time for underfloor heating and no radiators at all'.
Howard
I don't know the answer to this (do you need to consider whether your boiler is powerful enough?) but when I installed ^ those radiators ^ I didn't know that heat source pumps need bigger rads.
So when we do downstairs I am wondering the same thing - aesthetically we'd prefer smaller ones but if gas central heating is ultimately going to be done away with I don't want to have to rip up all our nice original restored floorboards to put in bigger rads...