In a saucepan, melt the butter, sugar and syrup together on a low heat, stirring constantly until melted together. Take off the heat.

Pour the oats into the saucepan, stirring to combine.

Pour the mixture into your greased and lined tin, pressing the mixture down with a metal spoon until well compacted.

Bake for 15 minutes at 180C until golden brown. Leave to cool. Cut into pieces when warm.