I think we know which side their on Rhoobarb. They look after no.1 and thats it.
Why on earth didn't they allow these people to be intercepted at Heathrow. Is this something to do with the fact that they're scared other countries may not extradite these people to the US if they remove them before the flight. They seem to be applying screwed up security thinking.
The sooner we forget this idea that this country has any kind of special relationship with the US government and start looking after our own the better.