A committed conscientious objector during World War I, he engaged with organisations including the Union of Democratic Control, No-Conscription Fellowship, and the Independent Labour Party.

Beyond his activism, Lloyd was a translator, editor of humanitarian poetry anthologies, and a dedicated field naturalist who made notable contributions to ornithology and entomology.

[4][5] As a young socialist, Lloyd spent time living and working at Toynbee Hall,[6] where he taught English Literature, reflecting his commitment to social service.

[7] Lloyd was an active member of the Humanitarian League and was a close associate of its founder Henry S. Salt, with whom he shared many intellectual and social interests.

In a 1913 article for The New Freewoman, he praised Dr. Magnus Hirschfeld's exhibit on intermediary sexual types as a groundbreaking challenge to rigid gender binaries and societal ignorance.

[9] Lloyd criticised the persecution of homosexuals and called for greater tolerance, framing gender and sexuality as natural continuums.

Collaborating with figures such as Edward Carpenter and Laurence Housman, Lloyd supported reforms in sexual education, LGBTQ+ rights, and divorce laws.

Lloyd was involved in organisations like the Union of Democratic Control and the No-Conscription Fellowship, fostering a closely connected London pacifist community.

He frequently contributed to British Birds, writing about topics such as the Stone-Curlew in Buckinghamshire (1921), the egg-laying habits of Grassholm Gannets (1926), and a rare sighting of a Marsh Warbler in Hertfordshire (1941).

He served as editor of the Transactions from 1935 until his death and contributed numerous articles, including "The Nesting of Garganeys at Elstree" (1931) and "The Distribution of the Grass Snake in Hertfordshire, with Notes on its Behaviour" (1936).