In a HARDtalk interview on 8 August, Stephen Sackur talks to the former UK head of al Muhajiroun, Anjem Choudary.
British Prime Minister Tony Blair has proposed a raft of anti-terror measures that include new grounds for deporting and excluding people from the UK - including fostering hatred or, advocating and justifying violence to further beliefs.
The four young Muslim men believed to have conducted the suicide bomb attacks in London on July the 7th were British.
Anjem Choudary was, until last year, a UK leader of the radical Islamist group al Muhajiroun.
Why does he think young Muslims are willing to carry out acts of violence?
HARDtalk can be seen on BBC World at 03:30 GMT, 0830 GMT, 1530 GMT, 1830 GMT, 2330 GMT
It can also be seen on BBC News 24 at 04:30 and 23:30