I was pretty sure these were right.
I'm the grandson of Jacob(jnr)'s son Alfred, via my father Harold (he's still interested in all this at the age of 94).
In the past I've found Findmypast almost impossible to use, but took advantage of a recent 'month for a pound' offer to scan through the Denbighsire BMD parish records.
Jacob snr does appear a bit erratic - as well as the apparent separation from Mary, I found two business partnerships dissolved - Davies and Savage Brick Manufacturers in 1861 and the Pant Brick Tile and Fireclay Co in 1871.
I'm still intrigued by where all these people were in 1851 - given the birth of Louisa in Ireland, it's possible they all headed over there - the timing is right for when they were trying to start a coal mining industry in northern Ireland.
I'm pretty sure Isabella is the baptized Belafina - and intriguingly there is an Isabella Davies, aged 15, in Ruabon in 1851, described as, as far as I can decipher "daughter of wife". But there is no wife, only John Lloyd - and two more Davies children - Benjamin 13 and Jane 9 (also son and daughter of wife). This could well be irrelevant.
If you PM me your e-mail I can send you copies of the other baptism
Thanks (I think this makes us second cousins)