the law the law
what is the law on this ?
well the customer is responsible for keeping his meters pristine... and also for paying for erm unpaid for electricity
clearly they thought you were criminally liable
but you havent made it clear if you were cleared
or if the electric co just say " sez you..." which would indicate that they still think
Here is a scholarly paper on estimating losses
https://www.merl.com/publications/docs/TR2015-005.pdf
and you are right - for meter bypass it is not a done deal
The over seer is Ofgem
and it is worth contacting them over estimation of losses because you are right
it is one bed - and and you have accurate records of its use and the cost of the elec used
( because the major part of your consumption you have paid for )
as far as I can see they can't use their estimates as a way of punishing you civilly
ofgem oversees this and so I think this is your first stop
and discussing disputes over estimates
and what exactly Ofgem advises
( like you know 'in the absence of better ways to estimate, then .... ) and you have a better way to estimate