This is a question from the form (for the CRB) I am filling in right now - to be checked for the permission to work face-to-face with visually impaired people.
This is a very formal document.
Why they use unspent in the context?
I’ve never met the word used in such a way…
In my view, spent is relevant to resources only (money, time,…), whereas a ‘conviction’ isn’t the case.
This is a special use of the word in this connection and means not completed. You might for example be banned from driving for 4 years and after three years you stll have 1 year ‘unspent’. You might be put on probation for say 12 months and after 10 you still have 2 months ‘unspent’.