First put grease proof paper in the tin so later you can just pull the mixture out when it is ready

Melt the mars bars, margarine and the golden syrup on a low heat stirring constantly.

Next add 5 cups of corn flakes or rice crispies.

Then stir until all the cereal is coated with the mixture.

Put the mixture into the tin and level it out so it is flat in the tin.

After melt chocolate when it is all melted spread it over the mixture

Finally put it in the fridge until it is set

And enjoy your mars bars delight :)