There is also no marriage of that couple on Freebmd for that date.
BugbearIf you check the details for the record set you will see that LAYSTON marriages only covers the years 1563-1836.Peter
If you look for Caroline in the Herts Banns (variation on Surname), you'll find that the groom's name is different in the iindex but same in the image.Gadget PS - I used Layston as a keyword