Today in World War II History—April 29, 1941
Thursday, April 29, 2021 by Sarah Sundin

Firemen hang a Union Jack on a lamppost after an air raid on Plymouth, England, early 1941 (Imperial War Museum: HU 36253)
80 Years Ago—Apr. 29, 1941: Heavy Luftwaffe air raid on Plymouth, England.
I think the strike may have commenced a month later, on May 29.
Hmm. Did some research – and you’re right. I’ve updated the post. Thanks for the catch!