Hi Dave
thank you for the very quick reply
the house will be heated with an airsource heat pump and is as insulated and air tight as we can afford - not quite passive according to the PHPP we had done. Windows face north for the view and I am not turning it around.
There is no gas in the village so everything will be electric, showers, cooking.
The three phase was due to looking to install PV panels and want to ensure we can add an electric car charger at a later date.
we may need to add a lift so we have designed in a cupboard with a removable floor between ground and first to allow this later.
looking at the info from SSE it looks like putting in a meter box on the boundary as a permanent feature would be the best option as we have a timber frame and no brick cladding.