Okay - I'm back inside now. It was getting a little lonely out there underneath the family tree.
Thanks to everyone who contributed their findings, above.
More progress with my quest to find 'backstory' on ggf Richard Nash has been made in the past 24 hours than I would've imagined possible. Yawning gaps have been filled.
However, there are still a couple of issues that I would like to solve. And I can't think of anyone, right now, better equipped to tell me how to do that than you guys.
1. I still haven't nailed a birthplace and date for my primary target, Richard George NASH. I've been led to believe, by several sources (but they might all be extensions of the same 'Chinese Whisper') that the equation was Bristol, UK, 1852.
However, I have since modified that date to a range, 1852 - 1854.
Similarly, now that I find the elder brother William James NASH is recorded as being born in IRELAND, I may have to broaden the scope for Richard's birthplace too. (That's a long way from Bristol, isn't it?)
(In this respect, as an aside to Ambly - I'm still not entirely sure what to make of your observation, - 'and all considered, I'm not entirely surprised at his place of birth'.)
I tell you what - it surprised me! (It is quite a way from Bristol, isn't it?)
2. Now, the matter of James Nash (snr's) wife, and mother of Richard Nash, nee June/Jane Duff/Duffy (Now, that does sound Irish!)
It would appear that she never reached NZ at all. How can I best explore her fate? I imagine she died some time between 1863 and 1873. How can I check this out?
I am truly very grateful to you guys - and where it looks like I'm kidding above, well, I am.
I'd be pleased to again hear your thoughts.
Best wishes
Ed Eyre
PS. I have just found this. It might explain why William James Nash was born in Ireland. (But I haven't tried to check the station of the King's Light Infantry at that time.) It may help, though, perhaps?