Thanks to all of those who have replied to me via Genes Reunited. I got around to doing a surname summary on Genes Reunited and saw that there were 399 matches for Caddie. A quick look through and I could see that there was a lot of detail that I had been unaware of prior to this, in particular Caddies in New Zealand, Australia and South Africa.
I have sent a large number of emails to all those who had trees and a wonderful few got straight back to me with details or shared their trees. The fantastic news is that a lot of the ones in New Zealand appear to link up and I have a whole family in South Africa.
I find that the Hot Matches on Genes Reunited just give me 'matches' to someone with the same name but born half way round the world from my relative. The surname search for One Namers has been so much more productive.