Hello,
I have found a Mary Bigwood in my family - born around 1754 in Westbury Wiltshire. I think her fathers name was William James Bigwood, but I have been unable to find out any more information.
Mary married Richard Sainsbury in April 1776, and they had six children.
Not sure if there is a connection, as I cant find any more Bigwood family members.
Hopethis helps,
Kindest regards,
Brenda.