It’s the only answer I can see. Latest plan from the increasingly reactionary Home Secretary- lock up people who know people who might be terrorists.

‘We are targeting support networks, the things that enable terrorism to be perpetrated by other people,’ said a source close to the Home Secretary, David Blunkett. ‘It is intended to deter people from hanging around the fringes of undesirables.’

If you want to do that then you should bar public access to the House of Commons as well.