Nato begins major Afghan offensive

Thousands of US, British and Afghan troops have launched the biggest offensive in Afghanistan since the overthrow of the Taliban in 2001.

Helicopter-borne forces are attacking the Taliban-held districts of Marjah and Nad Ali in Helmand province in a bid to re-establish government control.

The BBC's Ian Pannell is with B Company of the 1st Batallion of the Royal Welsh and reports on the build-up to the latest offensive.