CMP C15AA armoured ambulance

The following information was provided by Simon King. Thanks Simon.
That's the CMP C15AA armoured ambulance. They only ever made the one prototype, based on the Otter/C15TA family. It survived and was saved/restored by John Marchant in the UK. It was subsequently bought by Bill Gregg in Canada and on Bill's death, the whole of his CMP collection passed to the Canadian War Museum.