I thought even I couldn't go wrong! 3oz sr flour, 3oz oats rubbed into 3oz butter. Stirred in 3oz soft light brown sugar. Peeled cooking apples, bottom of a dish. Few blackberries, sprinkle of sugar. Topped with the crumble. 180 for 20 mins. I mean, it's edible and everything tastes ok with custard but it's distinctly meh and not a bit more-ish. What did I do wrong?