Martin Lewis has warned that his earlier advice for people on pre-payment meters to top up as much as possible may not work for all customers.
Speaking earlier this month , Lewis said that people with non-smart pre-payment meters could save money by buying energy before prices go up at the start of next month.
The cost of variable rate energy bills for the average household is capped by regulator Ofgem. That cap is rising from £1,277 a year to £1,971 on April 1 .
