 The third baronet was Comptroller of the Excise; he inherited the baronetcy from his childless elder brother Sir John Elwill, 2nd Baronet, on the latter's death on 10 September 1727.The fourth baronet inherited the Elwill baronetcy on his father's death on 2 February 1740.He was elected Member of Parliament in the Parliament of Great Britain for Guildford in the 1747 British general election and held the seat over three parliaments until 1768.