Not so, says a staffer.
Whoever the engineer who came to your house was, he was either not properly trained, or not properly equipped, to test the accuracy of your meter. I am an electrician, i used to work on metering, about 5 years ago. The standard procedure for dealing with a customers complaint of possible inaccurate meter readings, is either one of two things.
Either a check meter is installed, that is a second meter is fitted, readings on both recorded, and left in place for about 2 weeks. After this time, the check meter is removed, and both readings checked. Any inaccuracy can then be determined.
The other method is to use a meter accuracy tester, which consists of a clamp to fit around the outgoing live cable, and a reader which picks up the flashing light on your meter. The faster the light flashes, the higher the power consumption. this is then compared to the current measured via the clamp, and will determine the meter accuracy.
Most companies do tell customers that if either of these checks are carried out, and the meter is found to be accurate, then the customer will be charged for the visit. This helps to discourage everyone who thinks their bill is too high, from demanding a test is done.
I know we all love a conspiracy, but i have to say , that in the 40-odd meter accuracy tests, and about the same number of check meter installations i have carried out, i have never once found there to be a problem with the meter, all were reading perfectly.
Not everything in life is a conspiracy, and when you work everyday with the public, you soon realise just how many awkward, aggresive or paranoid nutters there are out there, just waiting for a chance to make a complaint against someone just doing there job. If there is an error, it is much more likely that the mistake lies in an incorrect tarriff, or a mis read meter, than a fault in your metering equipment.