Hi Julie ... yes we certainly have made some progress recently thanks to the info you supplied.
Lots more digging to be done though.

I do so love these searches which are shrouded in mystery. This McGRATH case has some strong parallels with one of my own families > my Australian-born gg/grandmother left a husband and babe in her wake and fled to the West Coast in 1865, later moving to Christchurch. Had it not been for an extremely dedicated (smallish) group of RootsChatters who embraced my search, I doubt her story, (riddled with myriad scandalous goings-on of a whole family both here and in Oz), would ever have been uncovered.
As you will have learnt already, finding some of our families, doesn't always come easy. I'm an advocate of getting "my hands" on as many official documents as possible - though at times the likes of B, M and D certs can prove disappointing (and misleading) - in the general scheme of things, they usually (eventually) assist in building a bigger picture. And of course there are a wealth of other resources which we can tap into. But it really is a matter of just chipping away; gathering all manner of information; the process of elimination ; working on hunches and theories, thinking "outside the square", etc. .... then attempting to put the "jigsaw" together.
Here's hoping we can continue on this roll.

~ Lu