Makeshift WW2 ARP Fire-engine/Emergency Vehicle

[Flying10uk]

When my Grandfather was in the ARP during WW2 they used an old wooden ammo box as a first aid box. It was old in WW2 and, somewhere, I still have it, still in the guise of a first aid box but has been repainted a few times over the years. When I find it I'll post some pictures and see if we can figure out exactly what it is, possibly WW1 but could be earlier.