I wouldn't expect to hear "all on my tod", just "on my tod". I can't say it's wrong, but it's not something I've heard. And I thought it came, somehow, from Sweeney Todd, a kind of latterday Cockney conservation of expression, using both parts of the name in different places. But I have never confirmed it.

Speaking of which, I saw what passes for the Sweeney these days in action in central London last night. Cars and coppers appeared from nowhere and the Bill broke into a house off Soho Square with very little - no, let me rephrase that, no ceremony. John Thaw wasn't there, though. Well, he wouldn't be would he, being dead an' all?