Heat oven to 170C
Layer the peaches in an oven proof dish
Mix together the flour, 3-4 cup of sugar , baking powder
Stir in the melted butter and milk
Spread over the peaches
Mix the remaining sugar and cornflour . Sprinkle all over the top
Pour on the boiling water
Bake for 45-50 minutes
When I say cup it's an American measure but any size cup will do , just use the same one for all the recipe