Re:
As I received no reply to my return e-mail, and then an aborted attempt to speak to me by phone, I thought I would take the initiative and ring British Gas.
I spoke to a very knowledgable guy who asked if I could access the meters, which I did, he then told me how to get readings from both, which I did. He looked at my account and said that as both meters had failed at the same time, he thought it was a comms issue, I said they were fine for two years, so he had me look at the little white transmitter next to the meters, sure enough that is the culprit.
So, upshot is an engineer from British Gas is coming to sort things out next week, my meter readings are now up to date and BG's overestimation of my electricity usage means I am going to get a sensible amount of money back.
Years ago I had issues with my broadband, and discovered a similar diamond within BT, the guy I spoke to talked me though the whole issue and we resolved it there and then, the guy at BG was the same last night, it seems that in a sea of corporate mediocrity, every now and again you come across someone who actually knows how to do their job and takes a pride in doing it.
Now all I need is for the engineer to do a good job.