DOWNING Street yesterday bolstered speculation that ministers have been pushing for an accelerated exit of British combat troops from Afghanistan to 2013, a year earlier than planned.

The current strategy is to withdraw the bulk of Britain's 9500 deployment in Helmand from their frontline role by the end of 2014, but reports suggest ministers, led by Chancellor George Osborne, are locked in intense discussions with military chiefs over their desire to see a withdrawal by the end of next year – saving the cash-strapped Coalition £3 billion.

No 10 repeated how the current UK Government plan was to withdraw combat troops by the end of 2014 and that a decision had been made to pull out an extra 500 this year. No decisions had been made beyond that, said a spokesman.

However, when asked about a speeded-up exit, he said ministers would consider other proposals "at the appropriate time" and the matter would be discussed at the National Security Committee (NSC), which is chaired by David Cameron, and with the International Security Assistance Force.

"The Prime Minister is very clear. He does not want to see a big cliff edge [reduction in troops] in 2014. We want to see a steady and measured troop drawn down. I would expect there to be discussions at the NSC but don't expect any imminent announcement."

The spokesman added: "We are going to make an informed decision and will look at all the issues in the round."

An expedited troop withdrawal is, however, causing major concern among military chiefs with one defence source saying they were "digging in and will resist this all the way".

Another warned that a 2013 withdrawal would "risk losing everything we've fought so hard for" and leave remaining troops more vulnerable to attack.