I think this is only a matter of time, although there may be an awareness among jihad leaders of how difficult things would (probably) become for them after suicide attacks in the West. From WND, :
JERUSALEM — Hamas has several cells inside the United Kingdom and is capable of attacking the country, a senior Israeli security official told WND yesterday. The official spoke in response to a sermon, broadcast live on Palestinian television earlier this month, in which a cleric associated with Hamas threatened terror attacks against Britain.
Sheikh Ibrahim Mudeiras, a popular Palestinian Islamic leader, said in a live sermon broadcast May 13, “We take this opportunity to hold Britain accountable and say there is revenge we can never forget! We cannot forgo the revenge we want to exact from Britain. We hold Britain responsible for what happened in Palestine. Britain is the cause, till this very minute, of every drop of blood dripping into this land.”
Mudeiras, who was lamenting Israeli Independence Day celebrations, continued, “I say to you: You must look at our situation with an outlook of confidence in Allah’s victory! If you help Allah [spread Islam], Allah will bring you victory. We once ruled the world and the day will come when, by god, we will rule the entire world. The day will come when we will rule the United States, the day will come when we will rule Britain, we will rule the whole world [and all will live in peace and comfort under our rule] except the Jews.”