Only for section 1, not for prohibited weapons -
Firearms Acts 1968 sec 54 para 5 b ii
Section 54 (5) of the firearms act is what grants permission for cadet forces to use firearms & prohibited weapons without a certificate.
So next time you’re on D&C camp just ask for confirmation that what you are doing is legal first.
For the record I do get a perverse geek out joy from firearms legislation 
https://forum.aircadetcentral.net/t/l103s-used-for-rifle-drill-parades/572/9?u=chief_tech