You may be lucky to find a reference for a Middlesex marriage here, details have been taken from the Phillimore Marriage Indexes published over many volumes.
http://www.angelfire.com/fl/Sumter/Middlesex.htmlVolume 01
Acton 1566-1812, Heston 1559-1812, Hanwell 1570-1812, Harlington 1540-1812, and Greenford 1539-1812
Volume 02
Hillingdon 1559-1812, Hayes 1557-1812, Northolt 1575-1812, Ickenham 1558-1812, Cowley 1563-1812, and West Drayton 1568-1812
Volume 03
Hampton 1657-1812, Twickenham 1538-1812, and Teddington 1560-1837
Volume 04
New Brentford 1618-1812, Hounslow 1708-1812, Stanwell 1632-1812, Sunbury 1566-1812, Ashford 1696-1812, Feltham 1634-1812, Hanworth 1732-1837, and Pinner 1654-1837
Volume 05
Uxbridge 1538-1694, Harefield 1546-1837, Great Stanmore 1599-1837, Enfield 1550-1837
Volume 06
Edmonton 1557-1837
Volume 07
Finchley 1560-1837, South Mimms 1558-1837, and Monken Hadley 1619-1837
Volume 08
Ealing 1582-1837
Volume 09
Tottenham 1558-1837
Coverage is not complete for all parishes for the dates shown, and from personal experience, names may be mis-transcribed or simply not transcribed. Please remember to try variant spellings if you are sure an entry should be there.