In preparation for the jihad against Dar al-Harb. 'UK faces threat from British Muslims returning from Afghan' from the Economic Times, August 3:

LONDON: The UK faces serious security threat from British Muslim extremists returning from Afghanistan after fighting alongside Taliban, a top British commander has said.
'There is a link between Kandahar and urban conurbations in the UK,' said Brig. Ed Butler, who spent six months commanding British forces in Afghanistan.

'There are British passport holders, who live in the UK, being found in places like Kandahar,' Brig Butler was quoted as saying by a daily newspaper.

The British commander said he had seen evidence that terror groups based in southern Afghanistan were plotting with Muslim extremists in Britain to carry out attacks in the UK. ....