Here is Henry and Maria's marriage record on ancestry:
http://interactive.ancestry.co.uk/16...nSearchResults
St Marylebone
Henry Jadis of this Parish Esquire, Bachelor, and Maria Elizabeth Adderley of Saint George Hanover Square Spinster were Married in this Church by Licence 9 Oct 1805. Witnesses Edwd Hale Adderley and John Wilkinson.
Interesting to see that Maria is down as a spinster, and no mention of the name Gardner.