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Thank you all for your advice. I can't believe that article, to think I changed to Scottish Power believing them to be cheaper, I won't use them again!
Simonruss, I had a smart card which I topped up in the shop. The meter cupboard door was never locked the whole time I lived there. so they could have come to update the meter any time they liked.
The thing is, I lived there for less than a year (just me and my daughter) so there's no way my bill could have been that high. I always tried to save energy where possible by switching things off at the plug instead of putting them on standby and for about the last 4 months, I was mainly at my boyfriend's house so I was eating, doing washing and showering there.
I hope I can get this sorted. Like I said I moved out 10th April and they sent me this bill and now I've had a reminder too and I'm getting a bit worried because there's no way I can afford that much money, and I really don't believe my bill could be that much anyway!
Can you advise me what my next move should be please? Thanks again!