Last autumn's sharp gas and electricity price rises pushed an extra 400,000 English households into fuel poverty, according to the Energy Department, DECC.
It says that "price
rises in the latter part of 2011 lead to an increase of around 0.4m households", taking the total to 3.9m.
Since then we've seen a modest cut in prices earlier this year, but British Gas has indicated that prices will rise significantly again before the coming winter.
So the fuel poverty total is likely to rise once more.
Fuel poverty is defined as households which spend more than 10 per cent of their income keeping warm.