Just had a strange and lengthy 'phone call claiming to be from EDF saying they're going to send me something to plug in to halve my leccy bills. I was then passed on to a supervisor who wanted my credit card number "for identification". Needless to say, I declined. The line then went dead, but someone called back. I didn't answer, but no doubt they'll call again. 1471 says "We do not have ..."
Is this a scam? They have no conceivable need for a card number, as I pay by direct debit, and isn't a utility bill a common means of identification?
Chris