SIR – Earlier this month I read my fuel bill would be increased by ten per cent. On listening to the Prime Minister he advised people to switch to a cheaper company. Simple!

Npower is imposing a 10.4 per cent increase – at £2.4 billion are they making enough profit?

Mr Cameron, speak about something you know about! Nothing. I’ll never believe another word you say. I’m sure Viscount Astor, David, your father-in-law, will be struggling to pay his fuel bills? I don’t think!

G H Thompson, Hartshead Lane, Liversedge