On Tue, 20 Oct 2009 15:46:58 +0100 someone who may be "John"
wrote this:-

I m confused as to what switches the heaters on - there are 3 heater outlet
points.

Get her to send a picture of the meter, or the make and model.

However, it sounds like the meter has a time clock built in with
terminals for 24 hour and off-peak circuits. For whatever reasons
the units used at the different off-peak times are recorded in
different registers and to get a total figure for these it is
necessary to add up these registers. The off-peak units may or may
not all be at the same rate.






--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000...#pt3-pb3-l1g54