Hello dobfarm,
The booklet arrived yesterday from The Pontefract & District Family History Society. It has just one baptism for Rhodes.
Martha, 10th Dec 1808, father Edward, mother Elizabeth, living at Little Smeaton. I'm willing to believe that John was from Church Smeaton and that Martha was his sister.
The year 1808 links nicely with John's estimated birth year and your suggestion of a baptism at Pontefract in 1805, father Edward, mother Elizabeth.
Many thanks, Rapsy.