Just bought an apartment, in Welly that doesn't have any built in heating.
Building design, bc rules and installation costs rule out a heat pump.
The bathroom has a heated towel rail (2kW), which will be adequate. The remaining area to be heated is about 35m2 and is made up of open plan living and two smallish bedrooms. It's a modern building with good insulation, double glazing and mechanical ventilation.
I think I need 5kW - 7kW of heating.
If left to my own devices I would probably slap a 2kW convection-radiant panel with a timer in the living area and rely on ventilation to move heat through the apartment.