When in March 1760 a vacancy was expected in the county Sir Wyndham, still on his Grand Tour, was suggested by the Kent Whigs as a possible candidate against Sir Edward Dering. ‘His not being acquainted with the gentlemen ought not to deter him,’ wrote Sir George Oxenden, one of the most zealous of the Kentish Whigs, ‘though we don’t yet know him, we all know Sir Edward Dering ... If the latter steps in now there will be an end of Sir Wyndham.’ Hardwicke had written to Newcastle on 26 Mar. that Sir Wyndham had gone out of England ‘as zealous for the King and his Administration as a boy could be’, and he had him brought back to England for the election.
On his first return Hardwicke wrote to Lord Royston: ‘It is ... a good thing for you and your fraternity’;
