Millions of UK households will be hit with a surprise rise in energy bills after Christmas, Martin Lewis has warned.
The savings guru pointed out that Ofgem will update its price cap from January 1, up from its current level of £3,549 a year for the typical household to £4,279.
Households are currently covered by the Energy Price Guarantee, which has "frozen" the average bill at £2,500 a year - although this isn't an absolute cap on what you could pay.
