I'm not sure the Ann Hartshorn marriage is yours at all.
Think this is more likely to be yours:
Joseph Johnson married Ann Atkinson 29/8/1802 St. Martin in the Fields, Westminster, London.
Have noticed, time and time again, that couples hailing from counties on the outskirts of London seem to marry in London for some reason.
Unfortunately, there are no other details on the marriage entry except that they married by banns.
Annette