Preheat oven to Gas 1.Line and grease a 7x11" baking tray.
Melt the butter, syrup and both sugars in a saucepan.Do not allow to bubble.
Mix in the oats and the cocoa.
Use a fork to press the mixture in to the baking tray and bake for 18 to 20 minutes. The flapjacks need to cook in the centre but you don't want them to bubble, otherwise they will be too toffee-like. They should stay moist.
Remove from the oven and allow to cool for about 20mins before slicing up.
Leave to cool completely before removing from the tray.
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