Terrorists will face longer in prison for offences committed inside
Nice idea it might keep them behind bars for another couple of months but does not address the real problem. What to do with terrorists who having served their prison sentence come out and because they are deemed to be a viable threat require 24/7 surveillance etc. Sadly as most will be UK born we have not got the deport option( If you can actually deport anyone these days) It would be nice if we could instead relocate them to the tiny bits of the empire we have left. South Georgia springs to mind. Nice and remote. Very cold in winter and they could terrorise the penguins instead of us.
Do what Tony Blair did. Put them into government in Northern Ireland