Hi Les

I had a look on OMI for your marriage for John Norris and Elizabeth Harper but there isn't one

Dont know if any of these help at all

16 Apr 1734 John Harper to Mary Cookton at Garsington
1 Jan 1767 John Harper to Mary Jarvis at Garsington
10 Jan 1768 John Harper to Ann Cleaver at Garsington
27 Dec 1770 John Harper to Elizabeth Harbert at Garsington
2 Aug 1708 William Harper of Horspath (w) to Jane Chillingwort of Horspath at Ox St Mary Mag
19 Feb 1781 Richard Norris of Little Milton to Elizabeth Freeman at Garsington
Shout if you need anymore look ups

Sue