S.K.
I am not really sure how this chat system works. I saw your post and registered as a user so that I might contact you.
I have sent one post but don't know whether you will receive it. I will try this personal post and see where it gets me.
There is a Mainwarring Nash connection through the marriage of Richard Nash (of Walberton, Sassex) and Jemima Mainwarring of Whitmore Hall.
We also seem to have a family connection through also a family connection through Frederick George Nash of Yea, brother of your Jemima Mainwarring.
I have a bit of information on the Nash side that might interest you. A property at Murrindindi was and is named Walberton after the manor of that name in Sussex.
Perhaps you can suggest how I can get more detailed information to you.
T.R.
