The original poster (Wendy Skye) states "my 2 x Great Gran was called Charlotte Oxenham who married Thomas Mortimore". Like you I have not been able to find a marriage between a Charlotte Oxenham and Thomas Mortimore (at least searching BMD). I tracked a Charlotte Oxenham born 1841 Tiverton through the '41 and '51 Census and a possible Charlotte "Osman" in '61. Couldn't find a Charlotte Oxenham for '71 but found the Thomas Mortimore and Charlotte that fitted the original poster's information (but nothing to confirm this Charlotte was originally an Oxenham). Tracked Charlotte Mortimore through '81', '91, '01 and '11. Married an Edwin Rich, Plymouth Mar 1893 5b 419 and widowed again by the 1911 Census. Re Charlotte's mother Hannah you have clarified why I could not find an Oxenham/Beer marriage. My wife was an Oxenham pre marriage, hence the interest.I have tracked her family back to John Oxenham Attorney/Solicitor born Oakford about 1788-1791 according to Census returns. Am currently planning trip to Barnstaple to check parish registers.