Can't find a marriage to Catherine but there is one to Sarah...
John Delamont. m Sarah Roles. 04 Feb 1722. West Coker, Somerset. (West Coker is about 1 mile from Hardington Mandeville).
There are also 2 burials that maybe associated...
Sarah Dalamount. burial 08 Sep 1791, West Coker, Somerset. daughter of John Dalamount and Catherine.
Ely Dalamount. burial 24 Feb 1782. West Coker, Somerset. son of John Dalamount and Catherine.
John and Sarah had a son John Delamont, b 1732, he married Mary Bord 23 September 1760, West Coker, Somerset.
John Delamont, b 1732, second wife Catherine Hawkins. b 1752. West Coker, Somerset. Married 18 January 1781, West Coker, Somerset. Their children, Ely 1781, Sarah 1784 and Elias 1791.