Pre-heat your oven to 160°c (140°c for fan assisted ovens or Gas Mark 2). Generously grease a 11 x 7 inch baking tray with butter/margarine. Set aside.
In a large bowl, gently crush your cornflakes with the back of a spoon – be cautious not to crush them too much, as you still want them to give a bit of texture and crunch.
Add the oats, coconut and caster sugar to the cornflakes. Mix the dry ingredients until they are combined.
In a small pan, melt the butter/margarine and honey over a low heat.
Pour the butter/margarine and honey mixture into the dry ingredients, and mix until combined.
Tip the mixture into your pre-greased tin. With the back of a spoon, push the mixture into the corners, flattening it evenly into the tin.
Bake in your pre-heated oven for 10-15 minutes, until it is a warm, golden colour.
Leave to cool completely before turning out onto a chopping board and cutting into slices or squares.