On Sun, 17 Feb 2008 03:27:28 -0800 (PST)
andyv wrote:

There's still 0.5 kwh going astray midnight to 6.00am and maybe all
day too, after I've accounted for everything I know about - fridge,
security lights, clocks, central heating and various other things like
garage door on standby. I wondered if there might be a clue in the VA
reading.

Most likely: pumps (CH) and motors (fridge/freezer), both inductive.
Do come back and tell us when you do find out.

R.