electricity bill

Assuming a unit is kWh, what frightens me is your 20p unit cost !

Yup. 10.84p/Kwh here.

Steve

FWIW I just moved mine from Powergen to BritishG. Powergen is very expensive now

You could certainly reduce your consumption a bit - but, as the others have said, your real problem is the excessive cost per unit. Have a look on:

I have had this for the last year. We have used almost exactly 1000 units a quarter for years and in May last year it suddenly jumped by

My meter has the spinning disk and is very sensitive to small use, so we can experiment, but with little luck.

You appear to infer that you have more than one security light and they are on a lot. Don't forget the loading on each of them is large and might account for a lot of your use.

Are they electric showers? 6 minutes using a 10kW electric shower is one unit. It is also worth checking that a loft light has not been left on (400Watts in my loft) and if you do have an electric immersion heater check that it has not accidently been turned on. Other than that test the meter. Turn everything off make sure the meter is not spinning and then run only one appliance of a known power rating, say a 3kW heater for 20 minutes and check that only one unit is used.

HTH

Adam

It happened to me a few years ago - eventually I tracked it down to the chest freezer where the thermostat knob was broken and although set for mid temperature it was nearly on max freeze!

Peter