as a politician denville was elected as the member of parliament (mp) for newcastle upon tyne central seat from sir charles trevelyan in the 1931 general election and held the seat until he was defeated in 1945. for a time he was associated with the far right of the conservative party, and during the 1930s was a leading member of the friends of national spain, which stressed support for francisco franco and anti-communism. he had also declared himself to be an admirer of benito mussolini although, in keeping with a number of contemporary tories who admired the southern european fascists, he was critical of adolf hitler.