Paul

So today was the day, meter (eventually) installed.

Not without its drama of course.
Meter 1 installed, turned fuse box back on .... nothing (except a puzzled electrician).
Some investigation later, they had told him the wrong type to install (E7), so it wouldnt power up [as he'd wired it] until midnight ...
So out with that one, in with Meter 2 (std) and we finally had power again.

Gas meter then changed without further issues.

IHD is now sitting on my desk (currently set to show "real time" usage).
Its only showing electricity readings atm. I'm told it will eventually display gas as well.

My house seems to run at about 490W in the day when no high power devices (kettle, shower, washer, cooker etc) are in use, thats dropped to around 420W now everyone has gone to bed (except me).