@les freathy
Hong Kong has a rather long tradition of building their own armoured cars.
For earlier vehicles of this type see The Overvalwagen Forum:
eg:
http://www.network54.com/Forum/33033...ad/1115454546/
and:
http://www.network54.com/Forum/33033...ad/1111339720/
and:
http://www.network54.com/Forum/33033...ad/1100033024/
and also Shanghai in the 1920s and 30s:
http://www.network54.com/Forum/33033...ad/1115281888/
Btw, you are welcome to post your question also there...
Kind regards,
Nuyt