The move is the result of deals with war-weary locals and reverses the strategy of sending forces to establish “platoon houses” in the Taliban heartland where soldiers were left under siege and short of supplies because it was too dangerous for helicopters to fly in.

Troops in the four northern districts of Sangin, Musa Qala, Nawzad and Kajaki have engaged in the fiercest fighting since the Korean war, tying up more than half the mission’s available combat force. All 16 British soldiers killed in the conflict died in these areas.

“We were coming under as many as seven attacks a day,” said Captain Alex Mackenzie of the 3rd Battalion, the Parachute Regiment, who spent a month in Sangin. “We were firing like mad just to survive. It was deconstruction rather than reconstruction.”

Lieutenant-General David Richards, commander of Nato forces in Afghanistan, has long been critical of tying up troops in static positions, while the British government has grown increasingly concerned that it was affecting public support for the mission.

Since taking command of the British forces at the end of July, Richards has been looking for a way to pull them out without making it look like a victory for the Taliban.

“I am confident that in two to three weeks the securing of the districts will be achieved through a different means,” he said. “Most of the British troops will then be able to be redeployed to tasks which will facilitate rapid and visible reconstruction and development, which we’ve got to do this winter to prove we can not only fight but also deliver what people need.”

The districts will be guarded by new auxiliary police made up of local militiamen. They will initially receive $70 (£37) a month, although it is hoped that this will rise to $120 to compete with the $5 per fighting day believed to be paid by the Taliban. “These are the same people who two weeks ago would have been vulnerable to be recruited as Taliban fighters,” said Richards.

“It’s employment they want and we need to make sure we pay more than the Taliban.”

The withdrawal of the British troops will coincide with the departure of 3 Para, whose six-month deployment is coming to an end. The battalion will be replaced by Royal Marines from 3 Commando Brigade who started arriving last week.

Locals in these districts are fed up with the fighting that has led to the destruction of many homes, bazaars and a school. A delegation of more than 20 elders from Musa Qala met President Hamid Karzai on Wednesday evening and demanded to be allowed to look after their own security. “The British troops brought nothing but fighting,” they complained. They pledged that if allowed to appoint their own police chief and district chief, they would keep out the Taliban.

The other crucial factor has been Nato’s success last month in inflicting the heaviest defeat on the Taliban since their regime fell five years ago. The two-week Operation Medusa in the Panjwayi district of Kandahar province left between 1,100 and 1,500 Taliban dead, many of whom were believed to be committed fighters rather than guns for hire.

“Militarily it was against the odds — it was only because the Taliban were silly enough to take us on in strength when we had superior firepower and because of very, very brave fighting on the part of Americans, Canadians, British and Dutch, as well as the Afghan national army,” said Richards.

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