On 1 March 2011, Theo and Lance Corporal Tasker were on a mission in support of the Irish Guards in the Nahr-e Saraj district in Helmand, when a fire-fight broke out, killing Lance Corporal Tasker.
The collision happened on the winding A487 at Pantperthog, north of Machynlleth, when the lance corporal and another serviceman - identified only as Soldier A - were on an advance trained course supervised by PC Keith Young of the West Mercia Police force.