Oh that is great

You are fortunate to have such intimate details from that period. You are quite correct about the Hatswell surname not looking local to Abingdon.
I found a couple more possible baptisms for children of John & Hannah
1771 21 Apr CHAINEY John son of John & Hannah, labr.
1777 20 Jul CHEYNE Richard son of John & Susannah, labr., Northcourt
I know the Richard one says Susannah but I thinkk it's them - we do have a burial for a Richard son of that couple.
I went looking for a marriage - the only one I can find is from the OFHS marriage index
1769 Nov 23 at Horspath
John Chainey of Abingdon to Susannah Stevens

DebbieG