Let's imagine that Fred Smith has been living in a house since 2007. He has a 3-phase supply previously installed for Economy 7 heaters (that are long gone). He's using the Day/Night tariff with his billing company, everything's been going well, Siemens reads the meters from time to time, bills get sent, and Fred pays as usual.
Now, he's getting a new extension wired in and his electrician discovers that the clock+metering thingummies have got the Night (cheap rate) and Day (normal rate) attached the wrong way around.
What to do?
The only dated thing visible is a tag to say the old meters were replaced with the new one in 2001. The seals (wire and paper) are unbroken, so it's not like someone's been fiddling.
Who's liable for the billing mistake? Will EDF / Siemens / billing company come after Fred for any shortfall? Fred hasn't yet worked out the figures. But it must have affected the house's previous owners, too. Keeping quiet about it seems daft.
Fred's going to have the 3-phase ripped out at some point in the future and presumably EDF's bod will notice?
Now, he's getting a new extension wired in and his electrician discovers that the clock+metering thingummies have got the Night (cheap rate) and Day (normal rate) attached the wrong way around.
What to do?
The only dated thing visible is a tag to say the old meters were replaced with the new one in 2001. The seals (wire and paper) are unbroken, so it's not like someone's been fiddling.
Who's liable for the billing mistake? Will EDF / Siemens / billing company come after Fred for any shortfall? Fred hasn't yet worked out the figures. But it must have affected the house's previous owners, too. Keeping quiet about it seems daft.
Fred's going to have the 3-phase ripped out at some point in the future and presumably EDF's bod will notice?