Her flapjacks are legendary and have huge emotional currency in the family. Here is the recipe for Jill's flapjack. Use it carefully. Preheat oven to 180C, grease and line baking tin of good depth.

Jamie Oliver’s flapjack biscuits are so straightforward to make in as little as 29 minutes that they’ll soon become a favourite recipe. Using just five simple ingredients, this recipe yields ...