Martin Lewis warning about ‘worrying’ prepayment meter trend

She said she was with Bulb, which was recently taken over by Octopus Energy, although Mr Lewis said she would still be on a Bulb tariff.The financial journalist said in reply: ‘Bulb, like many others, does reserve the right to come and back charge you for the difference between what you’re paying and how the rate moved up from the October 1 but I don’t know any of them [the suppliers] that are doing it in practice, so you should be fine.’The best thing for you to do, certainly on the electricity meter, don’t top up until the very last minute because it’s the topping up again that will make you move to the new rate.’And if the worst came to the worst and they did back charge you, but I think it’s very unlikely, then you would be in no worse a position anyway than you would have been, had you just topped up earlier.’READ MORE: ‘Don’t rely on state pension alone’ as age could rise ‘beyond’ 70 – how to plan ahead