My late mother (born in the 1920s in London, where she lived all her life) was fond of saying of anyone who wasn't helping in any particular job or activity that they were "Just standing around, like Toody Hotpot".
I've no idea if that spelling is correct: I doubt if she ever wrote the phrase down or had any need to do so, and even if she did I certainly never saw the result.
I regret never asking her where the expression came from, and subsequent research has failed to turn up any hints. Does anyone here know? Many thanks.