I'd expect a public outcry?
http://news.bbc.co.uk/1/hi/world/americas/3043332.stm
The tribunals have come under heavy criticism from human rights organisations.
http://news.bbc.co.uk/1/hi/uk/3044130.stm
"We urge the UK Government to strenuously object to any British national, or indeed any national, facing execution following the proceedings at Guantanamo Bay."
http://news.bbc.co.uk/1/hi/world/americas/3044278.stm