As there is training system for UK reserves it would not be impossible to have some conscription. Finding useful employment on the other hand would be more problematic.
Could some of the Swedish model be applied? Say a limited age range, say a stringent assessment regime, say a longer period of service? The pool could be limited to suitable unemployed people. In terms of work they might be employed in non-combatant roles currently filled by contractors.
With a tightening in immigration we are going to be short of waiters etc in the service industry - use conscription, get them trained, and when they demon, Bob's yr uncle
