Many thanks for your efforts.

I knew quite a lot of what you had there, but there is some new information - though not TRM's birth? George Denley Morgan (born in Bettws which is not Dolfor or Kerry) is new to me, as is Ann Elizabeth Morgans and Walk Mill - wherever that is!*
After some effort I had worked out that Jane was nee Denley, married a Morris, was widowed, married a Morgan, was widowed again, then married a Hamer! For a long time I had assumed her birth name was Morris.
Anyway its midnight and I must look again tomorrow.
*there seems to be one at Mochdre which is certainly in the same vicinity.