From the New Zealand Herald:

A British sniper in Afghanistan killed six insurgents with a single bullet after hitting the trigger switch of a suicide bomber whose device then exploded, The Daily Telegraph has learnt.

The 20-year-old marksman, a lance corporal in the Coldstream Guards, hit his target from 850 metres, killing the suicide bomber and five others around him caught in the blast.

The incident in Kakaran in southern Afghanistan happened in December but has only now been disclosed as Britain moves towards the withdrawal of all combat soldiers by the end of the year.

Lt Col Richard Slack, commanding officer of 9/12 Royal Lancers, said the unnamed sharpshooter prevented a major attack by the Taliban, as a second suicide vest packed with 20kg of explosives was found nearby.

According to the article, the sniper was using an L115A3 rifle: