Dear s.k.
You are looking for Mainwaring-Nash.
I am descended from the Nash line, also Mainwaring, and can possibly help you
Isabella Bance, b 1797, married Gawen Richard Nash, b 1794, at Bristol.
Gawen's sister was Julia Maria Nash who married Lieut Edward Jenkins R.N. at Clifton,Bristol
in 1818. Lt Jenkins was drowned at sea when his ship, the 'Frolic' was wrecked off the South Wales coast in 1831 (extensively reported in the 'Times') Mrs Jenkins (Julia) was left with 8 children, one of whom, George went to the Bluecoat school in Newgate Street,London, and from whom I am descended.
Julia Maria Nash was the daughter of Thomas Nash of Bristol, a merchant, but as yet I do not know his wife's surname, she was also called Julia Maria
Thomas died in 1829 at Bath. His brother was Gawen Richard Nash, b 1743 at Walberton, West Sussex who died unmarried. Another brother was Edward.
These three brothers were sons of Richard Nash (b 1694)who married Jemima Mainwaring (b 1710)
Jemima was the daughter of Edward Mainwaring (b 1681) of Whitmoor and Jemima Pye( b 1683) of Faringdon, Oxfordshire.
Both the Mainwarings and Pyes can trace their ancestry back to the Norman Conquest.
The Nashes were extensive landowners in West Sussex; Gawen Nash, Richard's father, married Isabella Pye who was Jemima's sister. This was therefore a 'cousin'marriage. This Gawen b 1668
was a London Goldsmith but is later described as a 'merchant'. He made a large gift of silver plate to the church at Walberton which is now kept in Chichester Cathedral.
I can trace the Nashes back to about 1554.
All this is part of a large pedigree which I have constructed showing the inter-relationship of the Nash, Mainwaring and Pye families. I was interested to learn about the Australian descendants.
G.T.