"Theoretically, hacking is possible, but car companies are very aware of that risk and busily preparing themselves, " says John Leech, of KPMG.

BBC: 'Every new car' connected to web by 2014

Manchester Withington MP John Leech, who is backing the campaign, said he would then take the bill through the House of Commons to make it law.

BBC: Alan Turing pardon campaign goes to House of Lords

Four Lib Dem MPs - Sarah Teather, David Ward, Julian Huppert and John Leech - voted against the government while Charles Kennedy and Andrew George abstained on the second reading of the legislation needed to implement the three-year cap.

BBC: UK Politics