oh goodness yes of course and I don't like my chances of searching through all the Johns born in Scotland during that period...
It may just have to remain a mystery.
John the future Asst Magistrate would have been about 13 when Lt Col John Taylor (he was a Capt then) married Sarah Falconar Graham in 1823 in Bombay
It was in Feb 1827 that the "young John Taylor" was travelling out from South Africa to India on the same ship as his future wife Tristiana and the rest of the Squire family.
It sounds a fascinating story I wish we could manage to find out who John's mother was.
many thanks again for all your help.