Grease a shallow 30 x 25 cm dish.
Melt the butter, sugar and syrup.
Add the rolled oats, stirring and mix well.
Mix well, place into the dish and spread to all corners.
Press down firmly to level the mixture and ensure an even thickness.
Bake in a moderate oven at 190 Deg C for 15 to 20 minutes.
Remove from the oven and divide into your preferred square size with a sharp knife, before leaving to cool on a window sill.
Once cool break into squares.
Store in an airtight container.