It just seems to me...

...that the alert should have been sounded when the British terrorists were at large, rather than after they'd been captured and confined.

I have a bit more respect (though it's possibly misplaced) for Scotland Yard than I have for the FBI, so maybe this plot is more significant than the recent farce in Florida.

Maybe not, though. It wasn't, at least, serious enough for Bushco™ to do anything about when it mattered, though apparently they knew.