He served in the First World War with the Australian Imperial Force in Gallipoli, Egypt, and France.

Granville served in the Royal Artillery as an officer in the Second World War, resigning his commission in August 1940.

[3] In 1942, he left the Liberal Nationals to form a "People's Movement" with his fellow MP Captain Alec Cunningham-Reid, who had been deprived of the Conservative Party whip after campaigning for the Independent candidate W. J.

[4] Attempts at popularising the Movement quickly foundered, however, and after three years sitting as an Independent Granville rejoined the Liberals in 1945.

He stood for the party in Eye in that year's general election, facing both Conservative and Labour opposition, and managed to scrape out a win by 949 votes.