RootsChat.Com

Yes, I like the look of that one mckha. So he had lost two wives and the latest child in fairly quick succession - no wonder he decided to make a fresh start abroad. He probably intended to send for the children once he had got sufficiently established but it took some time.
Edit -Thinking about it a bit more that leaves an even narrower window for travel out, and sheds doubt on the electoral roll in reply 3.
Valcharlie - I don't know why my note says 'Australia', it was written a long time ago, but I understand it was not uncommon to start in Australia and then move on to New Zealand

I have this person way out at the side of my family tree but I have not looked at these families for literally decades. What follows is not the help you need to prove the connection but might help with clarification.
In the days before research could be done on the internet I was in touch with a couple of William (of New Zealand)'s descendants - one who seemed like a competent researcher and one who definitely didn't. Looking at William's index card, I see I have a suggested possible middle wife for William (Ann Seal) in Hastings in 1853 but with the comment 'this doesn't look right!' presumably because there is no such marriage in the indexes.
I do have a New Zealand marriage, children and death for him but I do not have a middle name Henry anywhere. There is a pencil note 'find date of travel to Australia' which I obviously never did.
William and Harriet 'Golding'* are in Ore in the 1851 census, saying William was born in Westfield, clearly distinguishing him from the one born the same year in nearby Guestling. In 1861 William of Guestling is still there and William of Westfield has disappeared completely.
*The GRO indexes have Harriet Golden Phillips. I have not seen the certificate.
I have no further information on their children but emigration was encouraged at that time and if William had written to any of the family praising New Zealand then it would be a logical destination. Being in the workhouse does not neccesarily equate with desertion. At that time it would be difficult to earn a living as well as bring up young children, without a wife or paid housekeeper.
I always meant to have a fresh look at all my Kent and Sussex lines now that information is more readily available but I don't know if I will ever get round to it. William (of Westfield) Catt's great grandfather Soloman had a large family and my line goes to one of his daughters. Catt is a surprisingly common name in some areas.

Just as an afterthought - John Griffith describes himself as 'minister' rather than the more usual curate/vicar/rector. To me that would imply one or both could possibly be nonconformists. (I think they still had to marry in the parish church at that date) If he is in fact listed as vicar of Farleigh Hungerford then I am wrong. But it might be worth checking if there are/were any methodist chapels or similar in the vicinity and find out if their records have survived.

What is a core-worker?

"A core is a device used in casting and moulding processes to produce internal cavities and reentrant angles. The core is normally a disposable item that is destroyed to get it out of the piece. They are most commonly used in sand casting, but are also used in die casting and injection moulding. For example, cores define multiple passages inside cast engine blocks." - Wikipedia
(That was a better description than I would have managed.)The people constructing the cores for the moulds would probably have worked closely with the patternmakers who worked at each foundry.

I think the current version of Brother's Keeper is 7.5 so you would probably want to download the update before you start importing gedcoms.

It is a good while since I did anything like that, but on my BK if you go to Gedcom > Import that has a big warning about how all the newly imported individuals will just be added and not be checked for duplications, or how to keep them as a separate set. (you need to make a new folder first, before putting the new data in it.) Then whenever you want to change from one line of descent to another you go to 'open database' and pick the other one.

Afterthought - there is a disadvantage to having different families in different databases. Using Edit, Find, Select person will only list the people in the currently open database. It cannot produce a combined list of people.