How are you going to fund it? - prisons are expensive.
What do you do when the weapon of choice simply moves from being a knife to being a screwdriver or a pointy stick or a bottle of acid?
Forget the prison and skip directly to deportation for any second strike criminality.
How do you deport someone who's a British National or holds a British Passport?? (call it what you will)
5 to 10 years in the Nick for any of the above!!
I would pay a bit of extra tax to keep these B*******s away from society & away from my family.