Excellent. The UK has "terror police". These must be the same guys who stopped Miranda at Heathrow.
Terror makes everything different. There are different laws, different offences, different police, and no Magna Carta to speak of. Even though this guy has never been charged with any crime - domestic or international - he was denied entry to Canada in 2011.
Churchill got this one right:
You might however consider whether you should not unfold as a background the great principle of habeas corpus and trial by jury, which are the supreme protection invented by the British people for ordinary individuals against the State. The power of the Executive to cast a man into prison without formulating any charge known to the law, and whether particularly to deny him judgement by his peers for an indefinite period, is in the highest degree odious, and is the foundation of all totalitarian Governments whether Nazi or Communist.