From freereg this looks like the Ashman grandparents marriage record
St Mary Magdalene Writhlington 27 Jun 1857 James Ashman bachelor , coalminer of Writhlington and Ann Swift spinster of Writhlington. Groom's father James Ashman , engineer at coal works, spouse's father Job Swift coalminer. Witnesses John Padfield and Elizabeth Hearne. Marriage by banns.
If James Ashman's birthplace shown on the 1891 census is correct then this might be his baptism
St Peter & St Paul Kilmersdon 16 Mar 1834 parents James Ashman coalminer,abode Coleford & Susannah. There is a brother William baptised same place 31 Jul 1836, father's occupation shown as engineer.
James Ashman bachelor & Susannah Moore single both of Kilmersdon married Kilmersdon 25 Sep 1831, witnesses Frances Turner & Robert Branch, marriage by banns.
If you check on freereg.org it looks like you might be able to go even further back than James & Susannah. Happy researching
Shirl