With the information received this morning I have done some more searching for this gentleman, and found the following.
The name of Andrew John McKay was found on a Regimental list on the following site:
http://www.cforce.hkvca.ca/index.htm
He is not listed as being attached to any particular Company or Platoon. His home town is shown as Lindsay, Ontario
Also on the above site I found that he was shipped (third transportation - XD3) to Japan aboard the Tatsuta Maru leaving Hong Kong on Jan 19th 1943, arriving in Nagasaki Jan 22nd 1943. From there they travelled to tokyo arriving on Jan24th 1943, and was moved to his first POW camp (JP-Fu-5b) on Kyushu Island. This camp was under the control of Furukawa Industries and was a coal mine as far as I can see.
I also found him on the following site:
http://hongkongwardiary.com/hkwdhome.html
He is also listed there as unallocated to any Company or Platoon.
I passed the first pieces of information from this morning to my friend, and he sends his warmest thanks for your help. All he has to do now is find definite proof of the link between them, and whether there is any truth in the rumour that he ran/drove a taxi service on his return to Canada.
Regards to you all,
Paul