My, is that bad rhetorics. False and stupid propositions won't come true by repeating them. In order to not “allow terrorists the safe spaces to talk to each other”, he's denying the same right to everyone else, making all of us a terror suspect 24/7, from birth to death. Not only is that abandoning the Magna Carta (among other civil & human rights violations), it also explodes your suspect pool from a few selected ones to the whole earth population. Sounds like a really dumb idea if you're actually interested in catching any bad guys. I'll probably never understand how someone like Cameron gets voted into office in the first place.
All the more reason to become a member of the open rights group.
https://www.openrightsgroup.org/