I wonder if Thomas Bore came from Herefordshire. There’s very little online for that county at the moment, so his records might not show up.
It may be worth nudging this up once the London Metropolitan Archives reopen, as they may hold some answers, or clues.
They hold papers of John Pugh, as executor and trustee of Thomas Bore, which include:
1768 - Copy probate of Will of William Bore of Pembridge, Herefordshire
Copies of birth certificates of Mary Bore 1790; Sarah Bore 1793 and death cert. of Mary Pugh 1847
1734 Grant by Mrs.Martha Boare to son William Boare of her personal estate at Herefordshire.