Date of birth for Mathew James Everingham b 1768

Here is the baptism record mentioned in the main story;

This lists his parents as Joseph and Mary Everingham.

This could be my Mathew James Everingham, but maybe it isn't.  St George Church is a Church of England denomination, and still stands today in London.  

This is an early depiction of the church which was one of the twelve new churches designed and paid for under the 1711  Act of Parliament for building Fifty New Churches, and the sixth and final  london church  designed by the leading architect of the English Baroque, Nicholas Hawksmoor.