In 1727 Wootton was asked to paint the installation of Lionel Cranfield Sackville, 1st Duke of Dorset, as Lord Warden of the Cinque Ports. Called ‘A Prospect of Dover Castle’, the painting now hangs in the great hall of Knole House, his former country seat in Kent. This preparatory drawing identifies several of the riders, indicating whose portraits were to be included in the finished work.