Maybe its time for a re-think on cadets.
Cadets are a fertile recruiting ground for the Armed Forces. I'd say easily 25% of those serving have been in one of the cadet forces. Why aren't they properly resourced?
They wear military uniforms (but must buy their own boots), fire military weapons, using military ammo, eat military rations, why can't they use military MT? MT often sits idle on the weekends, when the cadets are busy. Just license the instructors appropriately, or pay ED pay to serving staff to drive for them. In the grand scheme of things, it would cost pennies.
The MT would also live in more secure accommodation. It's not that far of a stretch to suggest that anyone torching a minibus on an RAF station, Army barracks or RN shore establishment leaves themselves open to being shot in the process.