My great x3 grandfather, William Richer/Riches was baptised at Wimbotsham on 28 March 1798, the son of Thomas and his wife, Margaret (nee Snasdell). Thomas and Margaret had been married on 31 May 1790. Amongst their other children was John Gant Richer, who was baptised on 20 February 1803. I have not found any other John Richer born around that time in Wimbotsham but there are gaps in the records I've looked at. He might or might not, therefore, be the John Richer in whom you're interested. In some records, Mary Ann Gridley/Greadley appears as Ann.