I have been thinking about numbers etc and who initially would get these APCs in the British army
The Durham Light Infantry were the usual Guinea Pigs for anything new the British Army wanted to try out. There are photos of DLI wearing prototype uniforms that ended up as the Battle Dress, Helmets that ended up as the MkIII Turtle hat and carrying prototype rifles that ended up as the No4. They were also the first to be fully mechanised so I imagine they would have been the first to use a battle taxi.