His son, Percy Robert Diggle, was a rugby union international, representing the Combined British on the 1910 RFU tour to Argentina, an early incarnation of the British and Irish Lions.
Percy Robert Diggle was born on 27 November 1887, the son of the Venerable Archdeacon, the Right Reverend John William Diggle, who would later become the Bishop of Carlisle and his second wife Edith Moss, (the daughter of Gilbert Winter Moss and Eliza Seilliere Zwilchenbart whom he married on 23 April 1884).
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Also one of the main characters John Diggle, who was created especially for the show and is played by actor David Ramsey, is named after Andy Diggle, the author of the comic book series, as is John's brother who bears the exact name.