You talk about "several thousands" of Islamists who see ordinary folk as targets"
It was announced in the press a couple of days ago that MI5 believed there COULD BE UP TO FIVE HUNDRED YOUNG MEN who might return to Britain to continue their Islamic crusade - so already the official calculated figure has escalated out of all proportion from your hate factory.

Both are correct Jim.
400+ with ISIS.
Several thousands here with us.
BBC last October.
"Thousands of Islamist extremists in the UK see the British public as a legitimate target for attacks, the director general of MI5 has warned."
http://www.bbc.co.uk/news/uk-24454596