From 1925 to 1964, Ridley spoke every week at Speakers' Corner in London's Hyde Park.
[2] This small group might have become the British Section of Trotsky's International Left Opposition, but in 1931 Ridley and another member, Chandu Ram (H.R.
Aggarwala) wrote Thesis on the British Situation, the Left Opposition and the Comintern, with which Trotsky disagreed.
[3] Ridley then joined the Independent Labour Party, writing regularly in their paper.
Following the Second World War, he was in close contact with the Council communist Anton Pannekoek.