Is this the John and Mary in Folkestone in 1881 ?
RG11/1008; Folio: 104; Page: 59
John was a General Labourer - 2 sons, Stephen and Frederick born in Folkestone ?
Looking in FreeBMD - Not sure about Stephen's BMD Index entry, but Elham should be the district, and theres a Frederick entry there Sep Q 1879 Vol 2a Page 972 ..... purchasing the Cert would show Mary's maiden name ....