 At the end of the war, Marlowe was appointed as a King's Counsel and presided at several war crimes trials in Germany covering Nazi atrocities.In November 1941, Marlowe had been elected unopposed as a Conservative Member of Parliament for Brighton, and kept the seat at the 1945 general election.The two-member Brighton constituency was very large, and was divided in three at the 1950 general election, producing a safe Conservative seat in Brighton Pavilion, a potentially marginal seat in Brighton Kemptown, and an even safer Conservative seat in Hove.