Hi, As far as I know Robert travelled by himself to NZ. Will try to check dates. He was possibly enrolled in the coast guard in scotland/england. But at the time my late father was checking that the coastguard were relocating and all records were unavailable.
There was a "story" (unconfirmed) that 2 Craill brothers went from UK via south africa and 1 of them stayed in africa. But this may be unrelated.