On Public Member's tree, Richard GAMMON's born c1819 wedding certificate is available to view (via Ancestry)

He married at St Mary Magdalene 30 November 1858 - he was an Engineer, and a Widower - father Richard GAMMON, Millwright.

I'm having problems tracing Mary GAMMON (W) age 69 in 1871 born Gloucestershire, Newent, back to earlier census' - and this is the only census info on Public Members Tree on Ancestry.

? There is a Richard GAMMON, age 25 - on the Criminal Register at Gloucester Assizes - 2 April 1845, acquittal for Larcency.