I just baked this wonderful recipe from this months Prima magazine. I don't think they have uploaded it yet, but when they do it will be at the following link. http://www.allaboutyou.com/food/
My only alterations to the recipe, which I think lifts and adds extra dimension to the bake is a sprinkling of cinnamon over the plum layer and substituting the caster sugar in the crumble layer for granulated brown sugar. Which gives a more caramel flavour and adds extra crunch.