If, as suggested, from previous reply, Hempsted was a Parish for enlopements/clandestine type marriages etc. These are other marriages from people outside the area from Glos Marriage Index

Jeremiah HOPKINS of Tirley married Mary STAIGHT - 18 April 1807

John BARNES of Tirley married Susannah WHEELER - 13 July 1809

Thomas ADAMS of Newnham married Mary JENKINS - 20 February 1811

Samuel EDWARDS of Dursley married Elizabeth ROE - 22 June 1822

Cornelius MARFELL of Hope Mansell married Abia WILCE - 7 August 1833

George KNOWLES of Newnham married Elizabeth BRYAN (Wid) - 27 July 1836

Wikipedia : Clandestine Marriages

http://www.en.wikipedia.org/wiki/Marriage_Act_1753