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Afghan commandos, known as the Triples, supported the SAS and SBS for years in Afghanistan and were in danger of reprisal after the Taliban seized back the country in 2021.

Panorama has now heard eyewitness testimony from veterans who served in UK Special Forces detailing alleged war crimes stretching over more than a decade and involving the SBS as well as the SAS.

The Triples units - so-called because their designations were CF 333 and ATF 444 - were set up, trained, and paid by UK Special Forces and supported the SAS and SBS on operations targeting Taliban leaders in Afghanistan.

The SBS, the Royal Navy's elite special forces regiment, is also implicated for the first time in the most serious allegations - executions of unarmed and wounded people.

A veteran who served with the SBS said some troops had a "mob mentality", describing their behaviour on operations as "barbaric".