He was a member of the House of Commons Army Committee in 1919, and the following year criticised the actions of Brigadier-General Dyer in the Amritsar massacre following the official report into it.
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His elder brothers included the noted physicist and engineer John Hopkinson, and Sir Alfred Hopkinson, vice-chancellor of the University of Manchester, and amongst his nephews were engineer and scientist Bertram Hopkinson, and Austin Hopkinson, MP.