Criminals have managed to clone prepayment meter keys in order to make money by offering discounted credit to thousands of customers.

An estimated 85,000 households have been approached by doorstep salesmen since the start of the summer, according to industry body Energy UK.

But customers who buy the half-price black market credit could end up having to pay again for the energy use.

Energy regulator Ofgem has demanded a report on how the scam has occurred.

If something looks too good to be true then it quite often is.
I'm sure, however, that some people will have been fooled by this one.

And that's beside the fact the pre-payment meters are a bit of a scam anyway.