Start by chopping the plums and stewing them in a non stick pan over a medium heat with the sugar for approx 15 mins till bubbling.
In a large bowl add all crumble ingredients and rub the ingredients together with your fingers until the mixture turns to breadcrumb like consistency. Your hands should be cold for this to work well.
Lay the stewed plums out and add the topping till the plums are covered. We sprinkled a handful of oats over the top of our crumble but this is optional. Bake in a hot oven (180 fan) for approx 35 mins till the plum juices come through the top and the crumble is golden.
