5. Shashank Joshi, a senior research fellow at the security thinktank the Royal United Services Institute, said: "We have always known that it is exceptionally hard to understand who will become a terrorist. Masood is unusual in that only a minority become radicalised over the age of 30. His criminal record is unsurprising, as some studies show that a significant proportion of jihadists have had prior convictions."

Actually that isn't confirmation that Joshi is sure that Masood had been "radicalised". He is saying it would be an unusual example of the process, given the age at which it is hypothised to have happened.

It would clearly have been much easier to have sorted out this if the NHS workers had succeeded in preventing his death. And it would clearly be useful for the security agency to have that kind of information. For future planning.