I've got a CD of Hurst PRs so I double checked for the marriage, but, you're right, it's not there.
I then checked the baptisms for any Fanny/Frances between 1772 -4 and there were only 2:
Jun 10 1773 Fanny Rider d/o George & Elizabeth Jun 14 1774 Frances Moorer d/o Robert & Hannah
Hoping to discount one of them, I checked the marriages and burials - but no sign of either of them in Hurst.
The good news is that I checked out the IGI for marriages of either and found -
25 Aug 1800 St Mary, London John Walters & Fanny Rider
The bad news is that the IGI is one of those submitted by an LDS member rather than one actually transcribed from the PRs, so I don't know how much trust you can put in it. Not having any ancestors in London, I've no idea where St Marys is/was - perhaps someone else can help you out there?
Jill
Logged
See Surname Interests Table + Major brickwalls: John Frith mge to Fanny, Bucks? c 1798 Bathsheba Boothroyd bp W Yks c1802 John Bishop bp E Yks c1758 Joseph Symonds mg to Sarah, prob Berks c 1735-40 John Horwood mg to Martha, Berks c 1735-40 Sarah Sculler bp Berks area c 1675 Paul Phillips bp Berks/Bucks c 1720 William Newell bp Berks/Bucks/Oxon c 1765 Richard Troughton mg to Jane, Westmoreland c 1732 Mary Simon bp Shrops c.1795