Who was "Toody Hotpot"?
Solution 1:
The Concise New Partridge Dictionary of Slang and Unconventional English mentions "hot toddy" as rhyming slang for "the body" (Google Books).
As BertCoules admits, "Toddy Hotpot" could well be a corruption over time. Bert's mother's expression could refer to a dead body, a still body that will not help in her task.