Cannot see Mary Hales marriage in Uppingham.
From Uppingham parish microfiche I can confirm:
William Hales and Ann Clarke both OTP married by Banns at Uppingham 8 August 1773.
Francis, son of William Hales and Ann baptised 30 April 1774
Elizabeth, daughter of William Hales and Ann baptised 21 October 1775
William, son of William Hales and Ann baptised 5 April 1777
Thomas, son of William Hales and Ann baptised 1 July 1778
Mary, daughter of William Hales and Ann baptised 29 January 1780
Berthia, daughter of William Hales and Ann baptised 3 November 1781.
On IGI there is an extracted record for the marriage of Mary Hails to Robert Sharpe on 23 March 1807 at Cottesmore. Could this be the one?
LauraEJ on the Rutland board has Cottesmore parish records and might be able to check for the names of the witnesses just in case they provide a clue.
Francis Hails was married at Edith Weston on 19 March 1801 (IGI).
Crowboy