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https://en.wikipedia.org/wiki/List_of_largest_funerals says that the number of attendees for Churchill was "(6,000 at funeral service) 500,000", while the number for Elizabeth II was "(2,000 at funeral service) at least 1,000,000".
https://en.wikipedia.org/wiki/Death_and_state_funeral_of_Winston_Churchill
Doing some research, it appears to be out of date. I updated the clue.