2009 also saw his second appearance in "Midsomer Murders", in an episode titled "The Dogleg Murders". In 2010, he appeared in Doctors as Anthony Chippington, a friend of Charlie's. He played Harrison Ashton Lard, the "posh girl's father", in How Not to Live Your Life. He provided additional voice-over for World's Craziest Fools. He appeared in the final two seasons of Foyle's War as Sir Alec Myerson, the title character's boss at MI5. Vansittart also appeared in the BBC Three comedy Bad Education, playing Mr. Humpage. Since 2014, Vansittart started playing Lord Yohn Royce in the HBO series Game of Thrones, making recurring appearances in season 4, 5, 6, and 7.