A new timetable that would see a complete unilateral British withdrawal from Iraq by next May will be presented to incoming prime minister Gordon Brown within weeks of him taking over from Tony Blair on June 27, said the newspaper.

Under Blair, Britain has consistently maintained that any pullout of troops in Iraq should be dictated by events on the ground, not a timetable.

But the broadsheet said Brown will be told by defence chiefs that Britain should withdraw from Iraq in "quick order" so as to bolster efforts to beat Taliban insurgents in Afghanistan.

"Britain is not physically capable of fighting wars in Afghanistan and Iraq at the same time," the unnamed senior military official told the weekly.

"The question is: which do we give up? The government and the defence chiefs have decided that we should give up Iraq.

"There is an agreed timetable, a glide path, which will see a complete unilateral withdrawal in 12 months."

However, many senior officers believe Iraq is strategically more important to Britain's interests than Afghanistan and the plan has not met with their approval, said the newspaper.

"There is a belief within the Ministry of Defence (MoD) and government that success is easier to measure in Afghanistan and that makes it more attractive," the official said.