British suicide bomber dies in attack on Iraqi forces in Mosul per BBC News

The BBC report http://www.bbc.co.uk/news/uk-39045923 that:

'A British IS fighter who died in a suicide bomb attack on Iraqi forces in Mosul is a former Guantanamo Bay detainee, the BBC understands.'

A former Guantanamo Bay detainee? That's really odd as the BBC have been ever so careful to ensure that the British public believe that Guantanamo Bay was full of innocent people.