This could be a faulty meter.  If you speak to your energy supplier they can add another meter in line and see the difference and then confirm it is indeed faulty.  They might try and charge you for this.  They may state that if the meter is not faulty they will charge.  Another point to consider is most bill are made up of 2 parts, standing charge and usage charge.  The standing charge is the rental of the meter to yourselves.  Sometime the rental can be higher than the usage charge.  An alternate option could be to rent a Chauvin Arnoux (PEL) Power and Energy Logger from a wholesaler like CEF or CA themselves.  I think its about £20 a week.  These can show you what is going on on the load and supply side of your meter.  This may help to confirm the meter is faulty.  I am sure Kevin at CA (Chauvin Arnoux) could advise you further

URL below for web site Chauvin Arnoux

https://www.chauvin-arnoux.co.uk/en

1.3 amps is a lot to be going astray. Usually this is things like frost heaters in greenhouses or lofts that have become jammed on and forgotten - but in this case all loads from the meter are off ?

In a block of flats there is an unlikely but not impossible case if a lot the wiring runs together, do not rule out the possibility that your meter also supplies something else it is not supposed to - especially  if there have been repairs for another flat that have either accidentally or deliberately tapped into the wrong cable...

If you can, take a picture of the meter reading current, and the breakers clearly off, and the wiring in between all in the same image - and send it to your supplier. (or post it here first if you would like us to see if we can spot some thief wiring to the neighbours or something...)

But yes a broken meter is quite likely. And leave it off for as long as you can - it maybe that someone notices the outside lights have stopped working or something....

mike.

Maybe a long shot but extractor fan in the bathroom with humidity sensor.  Lets wait for the pictures

mind you 300W is a big fan - I think they'd notice... Fan heater maybe, depends how 'off' everything really is.

M.

If you can see all the wires from the meter to the consumer unit(s), all the way along, then check that you aren't powering something else besides the main consumer unit.  That's a lot more difficult if the meter tails disappear into the fabric of the building, and pop out again somewhere else.

If it's a communal meter cupboard, do a sanity test.  Most meters have a flashing light to give an indication of the power being used.  Turn off everything you can, then get someone to turn on a high power appliance, such as a kettle, while someone else watches the meter.  The change of flash rate should be very obvious.  It's all too common for meters to be muddled up in a block of flats.

it showed about 1.3A. If this use was all day that would be 7kwh per day.

Not necessarily - the power factor on some small electronic equipment (including things like PV inverters here) can be absolutely awful - I've often had the cheaper domestic "energy monitors" (the type that just have a clip-on CT and assume mains voltage) claim that things (especially on standby) are consuming many tens of  Watts, whereas a proper watt meter confirmed that the consumption was in reality a small fraction of that.

   - Andy.

Standing charge?

Hello, you lot!

Look, there's no obvious smart meter accuracy when an arbitary standing charge is applied to your account. You use less and pay more for a cock-eyed priviledge.  

SMET1 was a failure because of poor design and rediculous management by the electricity suppliers. SMETS2 is struggling to gain acceptance because customers no longer trust the suppliers to play with a straight bat, even though many of the past idiosycrasies have been ironed out 

So It appears if you want to become a headlining act you need to take the granmas with you, which, of course,  the power utility companies have followed with gusto....

The meter will clock up over ten pounds in standard charges in three weeks.

Using it as a an electrical test meter to measure current in milli amps or even amps is going to be problematic, zeroing any clamp meter can be challenging, they are much better at determining the value of a steady load than nothing at all.

Thanks for all your inputs. I have now tried the same test on my home electricity and turning the isolation switches off does what I would expect - 0A being consumed. So I am pretty confident the meter at the flat must have a fault.

Why the total consumption for a period does not add up to much more I do not understand. The standing charges etc. are all taken into account, it is purely the consumption at issue.

I have now given this information to the electricity supplier and posed the question to them.