I'll let you know if I dig up anything in the wills for Huntingdon, and I will wait to see if you are able to dig up more information on the Ibberson plaque at Great White Baptist Church
I do have a copy of the below Ramsey wills from my family tree...
This is for Sarah Ibberson's husband John Saunders:
England & Wales, Prerogative Court of Canterbury Wills, 1384-1858
Name John Saunders, of Ramsey Huntingdon, Farmer
Probate Date 9 Oct 1837
Written 5 Feb 1837
Codicil 8 Feb 1837
It does not mention Great White specifically, but does mention land in Ramsey of course. No mention of the Meeting House or the Fullilove family.
This is for the husband of Elizabeth Overall (a cousin to Francis Ibberson's wife Carrina Overall):
England & Wales, Prerogative Court of Canterbury Wills, 1384-1858
Name Peter Descow, of Ramsey Huntingdon, Gentleman
Probate Date 14 Nov 1770
Written 1 Jun 1770
A very lengthy will with references to lots of parcels of land in Ramsey, but no mention of Great White, the Meeting House or Fullilove family
This is the son of Elizabeth Overall & Peter Descow:
England & Wales, Prerogative Court of Canterbury Wills, 1384-1858
Name Peter Descow, of Ramsey Huntingdon, Gentleman
Residence Ramsey, Huntingdonshire, England
Probate Date 14 Apr 1785
Written 18 Mar 1780
No Mention of Great White, the Meeting House or the Fullilove family
I can see that there are some other Ramsey wills on Ancestry:
England & Wales, Prerogative Court of Canterbury Wills, 1384-1858
Name Henry Hampshire, of Ramsey Huntingdon, Woolcomber
Residence Ramsey, Huntingdonshire, England
Probate Date 7 Aug 1794
Written 15 May 1794
Mentions: Property in Great White to sister Elizabeth Moon (as per the 1806 Deed), no mention of the Meeting House or the Fullilove family though
England & Wales, Prerogative Court of Canterbury Wills, 1384-1858
Name Joseph Saunders, of Ramsey Huntingdon, Yeoman
Probate Date 30 May 1786
Written 15 Sep 1785
Mentions property in Great White (purchased of John Fitzjohn), and his own dwelling house in Great White, but no mention of the Meeting House or Fullilove family
England & Wales, Prerogative Court of Canterbury Wills, 1384-1858
Name Thomas Augustus Ridlington, of Ramsey Huntingdon, Gentleman
Residence Ramsey, Huntingdonshire, England
Probate Date 7 Oct 1808
Written 7 Sep 1807
No mention of Great White, the Meeting House or Fullilove family
Jenny