Very well done! 
One point for you!
I leave it open for a short time in order to get some more infos maybe..
Here you are: this car was built by Bowrington Motors (Happy Valley), it was called BM Junior and was powered by a 50cc Vespa engine. It was not a one-off. They were used also in the Junior Traffic Training exhibitions held by the Hong Kong Police & traffic departmen as shown below. There were different versions.
NB: Mr Alan Chung seems to be quite concerned about the use of his pictures:
NOTE: These are my family privately owned photos that I disabled downloading from Flickr. Recently I discovered that many people copied some of my photos by other means & posted on Facebook & various web sites. My late family members are in some of these photos. Please show respect & do not violate copyright.
I am using these pictures with all the respect they deserve and I won't make any profit sharing them here with you. I like this little cars and I still think they should be known to a wider public.
I can remove them if the owner wants me to
