This has probably been mentioned many times before, but it bears repeating.
The final four British detainees at Guantanamo Bay were released this week after negotiations between the British and American governments. They had been held at the legally ambiguous camp for three years.
On their return to Britain they were questioned, determined to pose no threat, and released within 24 hours.
The UK police are now having to defend arresting these men at all. For less than a day.