Dashwood was re-elected for New Romney on 26 June 1747, and in January 1751 made a rather ostentatious disavowal of Jacobitism, of which Andrew Stone and others of George, Prince of Wales household were suspected. At Leicester House Dashwood abetted the influence of George Bubb Dodington (Lord Melcombe), and opposed the Regency Bill of 15 May 1751. On 13 April 1749 he was created D.C.L. of Oxford University, and on 19 June 1746 he was elected a Fellow of the Royal Society