A soldier from 3rd Battalion The Rifles has been killed in Afghanistan, the Ministry of Defence has said.
The soldier was killed by "enemy action" while on patrol in the Nad-e-Ali district of Helmand Province, the MoD said. His family have been told.
His death takes the number of British service personnel killed in Afghanistan since operations began in 2001 to 423.
Spokesman Maj Ian Lawrence said the taskforce's thoughts and prayers were with his family and friends.
"It is with great sadness I must inform you that a soldier from 3rd Battalion The Rifles has died as a result of injuries sustained whilst on patrol in the Nad-e Ali district of Helmand Province," he said in a statement.
Earlier, the International Security Assistance Force (Isaf) said three US soldiers were killed in an incident in south-west Afghanistan by "an individual wearing Afghan uniform".