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Heat oven to 200C/180C fan/gas 6. Whizz bread to chunky crumbs in a food processor. Spread over a large baking tray and bake for 10-12 mins, stirring now and then until evenly crisp. Scrape into a bowl and stir in the butter, sugar and cinnamon. Reduce oven to 160C/140C fan/gas 3.
Put the plums, sugar and cornflour into a large lidded pan. On the heat, stir for 1-2 mins until the cornflour is incorporated. Add 200ml water, cover and simmer for 15-20 mins.
Layer up the plums and crumbs in an ovenproof dish, finishing with a layer of crumbs, and bake for 20 mins.