Frank wrote:

Thanks for your comments. I agree that a second mains supply is the
best long-term solution. I plan to pay out for that when finances
permit - perhaps next year.

In the meantime, I need to decide on the next-best alternative setup.
I will probably be living in the first floor flat myself, with a
tenant in the ground floor flat, in coming months.

I don't know the actual cost of getting a second mains supply
installed; does anyone here have any idea? I'm guessing it won't be
cheap (£500-ish+?). Modifying the existing wiring, on the other hand,
(e.g, installing coin or card meters) is easy to do.

Frank

£270 for the flat we've just completed, the EB won't allow submeters.