Britain is set to leave a contingent of around 100 troops in Afghanistan to help support the embassy and other diplomatic efforts in Kabul, it is understood.

They will be part of a small footprint of foreign forces, including around 650 American soldiers, that will stay on the ground longer term as the 20-year military mission ends.

Defence Secretary Ben Wallace and his US counterpart, retired four-star General Lloyd Austin said both countries were on track to complete the withdrawal of all other troops by the end of August, even as the Taliban gains ground.

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