In addition to missing once more the opportunity to inequivocably condemn terrorism with no ifs and buts, it looks like they picked the wrong timing for issuing threats.
UPDATE: Lord Stevens, former police chief, nails it down perfectly in this News Of The World article:
WHEN will the Muslims of Britain stand up to be counted?
When will they declare, loud and clear, with no qualifications or quibbles about Britain's foreign policy, that Islamic terrorism is WRONG?
Most of all, when will the Muslim community in this country accept an absolute, undeniable, total truth: that Islamic terrorism is THEIR problem? THEY own it. And it is THEIR duty to face it and eradicate it.
To stop the denial, endless fudging and constant wailing that somehow it is everyone else's problem and, if Islamic terrorism exists at all, they are somehow the main victims.
Because until that happens the problem will never be resolved. And there will be more 7/7s and, sometime in the future, another airplane plot will succeed with horrific loss of innocent life.
Equally important, those British politicians who have seemed obsessed with pandering to, and even encouraging, this state of denial, must throw off their politically-correct blinkers and recognise the same truth—that Muslim terrorism in Britain is the direct responsibility of British Muslims.
[...] every airport in Britain is in chaos over the plane bomb-plot alert as every passenger is subjected to rigorous security checks. Why? They take lots of time, lots of staff, and are extremely expensive. [...] the truth is Islamic terrorism in the West has been universally carried out by young Muslim men, usually of ethnic appearance, almost always travelling alone or in very small groups.
This targeting of airport resources is called passenger profiling—the Israelis invented it and they've got probably the safest airports and airlines in the world.
[...] Well, Muslim terrorism in Britain is based in, has its roots in, and grows in, our Muslim community. The madmen of 7/7 and other suicide bombings didn't hide among the Hindu communities, worship in the Sikh temples, recruit at Catholic churches, did they? It may be true that events in Iraq have angered sections of the Muslim community.
[...] The absolutely unacceptable problem is that this opposition is used by too many to turn a blind eye to, or excuse, terrorists in their midst.
Blasting a passenger airliner out of the sky, killing hundreds of innocent men, women and children, is NEVER acceptable. Under any circumstances. There is NEVER an excuse.