SaintSatan:
I think the use of the word "harbouring" is not really correct. It implies a safe haven for terrorists, even that a particular government will not only tolerate them, but suuport them. Afghanistan's Taleban certainly "harbours" terrorists. The UK government certainly does not, despite what loonies like LaRouche spout.
It's probably more accurate to say that terrorist cells operate in Britain, to raise funds and materiel for their operations that are only available in a free capitalist society.
Some of these terrorist cells will certainly be known to British security forces. Infiltrating them is obviously the best way to gain intelligence of their future agendas. Some terrorists will of course not be detected, hence the numerous bombings in London over the past few decades. Certainly international terrorist groups use London as a base of operations, it is a huge international city and easy to get lost in. Sometimes the catch-a-monkey approach will work, sometimes it wont. In this respect Britain is the same as any other Western country, America included.
Expatbrit