Diggle was born in 1880, the son of Wadham Neston Diggle who had previously been a Lieutenant in the Royal Navy and his first wife, Emma Cookson. Diggle senior subsequently married on 5 April 1883 Lily Julia Noble (d. 25 January 1942).
He entered the Royal Navy, training like all other naval cadets at Britannia, and was on 8 June 1897 appointed to the battleship HMS Royal Sovereign as a Midshipman. Diggle was soon after appointed to the battleship HMS Mars, when he was selected to travel with a procession of 12 pdr guns in Queen Victoria's Diamond Jubilee parade through London.
In addition to the CMG, Diggle was awarded the 1914 Star, the World War I British War Medal, the World War I Victory Medal, the Queen Victoria Diamond Jubilee Medal, Officer of the French Legion of Honour, Officer of the Order of the Crown (Belgium), the Croix de guerre 1914-1918 (France) with palm, and the Croix de guerre (Belgium) with palm.
After his retirement from the Royal Navy, Diggle lived in the village of Tellisford, Somerset and he became a director of the investment company the Sons of Gwalia Limited.
- "Marriages". Marriages. The Times (30789). London. 9 April 1883. col A, p. 1.
- "Deaths". Deaths. The Times (49144). London. 27 January 1942. col A, p. 1.
- "Naval & Military Intelligence". Official Appointments and Notices. The Times (35918). London. 8 May 1897. col C, p. 10.
- "No. 27426". The London Gazette. 18 April 1902. p. 2601.
- "Naval & Military intelligence". The Times (36744). London. 17 April 1902. p. 7.
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