Hi, Think you may be looking in the wrong county, Crowhurst is in Sussex but I can't find a marriage to Sarah Ridley in 1783. There is one to Sarah Morley in 1821 in Brighton, Sussex. William may have been born 1763, Westham, Sussex. or 1764, Cuckfield, Sussex.
What details have you for Mary? There is a William Gower m Mary White. 1820 Brighton, Sussex. and William Gower m Mary Shoosmith. 1815 Hellingly, Sussex.