Hello Wendy,
I had noticed that Thomas Jones 1836 Baptism, same parents names and chapel as Miriam Jones July 1834, but a slight discrepancy with the age of Thomas on the following Census:
1841 age 3 b.1838
1871 age 32 b. 1839
1881 age 44 b. 1837
1891 age 54 b. 1837
As the 1881/1891 Censuses (perhaps the most accurate ones), were taken before August, he would be 44 and 54 respectively, and from August in each year he would be 45 and 54, thus giving a birth year of 1836.
Thanks for the information, it's now looking a distinct possibility.
Kind regards
Philip