If it happened in Britain, of course it could happen here.
Britain's intelligence services are the equal of anyone's.
They don't have a written constitution with a Bill of Rights. There's no 4th Amendment in the UK, and their courts don't have an exclusionary rule that prohibits the introduction of illegally obtained evidence.
Their intelligence and law enforcement people aren't hamstrung by their laws, and they have much more leeway to conduct wiretaps, other electronic surveillance and warrantless searches of premises.
Almost 35 years of IRA terrorism has given their law enforcement people a lot of experience, and their laws allow the authorities to detain terrorist suspects without bringing charges, sometimes "At Her Majesty's Pleasure", which means they throw away the key.
Their miltary special operations folks are the gold standard world-wide and they can be employed domestically. And have been reputed to have been used as hit squads against the IRA and INLF.
And, you have to believe that whatever intelligence the US has gleaned against Al Queda and its friends since 9/11 has been shared with the Brits.
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