He became a specialist in commercial litigation in London, was appointed a
King's Counsel in 1926 and was appointed
Recorder for Portsmouth in 1928 and Recorder for Bristol in 1929. A mutiny in
Dartmoor Prison on 24 January 1932 led to the setting up of a commission of enquiry under du Parcq. His report was considered satisfactory and he was rewarded with an appointment to the
King's Bench Division as a judge, receiving the customary
knighthood. Invested to the
Privy Council in 1938, du Parcq was
Lord Justice of Appeal from 1938 to 1946. On 5 February 1946, he was appointed
Lord of Appeal in Ordinary and was created a
life peer with the title
Baron du Parcq,
of Grouville in the Island of Jersey. During
World War II, he chaired the Channel Islands Refugees Committee which raised funds, gave financial relief, distributed clothing, traced relatives and gave guidance and help to refugees. The UK government relied on the Committee for information on the Channel Islands and in September 1940 his first appeal for funds on the BBC's 'The Week's Good Cause' programme raised what was then a record result. In 1946 he became chairman of a
Royal Commission into justices of the peace. He was a member of the
Permanent Court of Arbitration at
The Hague, and was an Honorary Fellow of Exeter College and Jesus College. du Parcq was also the author of a four-volume biography of
David Lloyd George, published between 1911 and 1913, though for unknown reasons he avoided referring to it later in his life. du Parcq died in a London nursing home on 27 April 1949. ==Notable trials==