Benjamin Richards' father William Richards, Melinwaun , Talley. William was the miller on the Edwinsford estate.
I've looked at several documents relating to the estate, one refers to work being done on the mill in 1811. The reference states " Paid William Richards, carpenter for work done"
Parish records for Llansawel (next parish to Talley and where Edwinsford mansion was). Baptism of William Richards, 1799; Richard Richards, 1803 and Evan Richards, 1804. The father being William Richards, carpenter, Garnwen, Llansawel.
No reference to Benjamin Richards but I have not found baptisms for Williams' other children either
According to the IGI William Richards was born in Garnwen, Llansawel circa 1771 and married his wife there. Check out "Family Search web site"
Check out old-maps.co.uk. Type in Garnwen, Llansawel in the address box. Go into view your map and then enlarged view.
Just further down, below Edwinsford you'll find Melinwaun.
Let me know how you get on
Nigel