Wash and dry the apples thoroughly. Impale them on the skewers.
Place sugar and water into a saucepan, stir over heat until the sugar is dissolved. Add butter and glucose, cook rapidly, without stirring until it reaches 150 degrees C or is at hard crack stage.
When mixture stops bubbling, add the red food colouring.
Stand the saucepan in a large bowl of hot water to prevent the toffee from setting. Dip apples into the toffee to coat thoroughly. Stand upright (apple down) on a greased tray to set. When cold wrap in cellophane or greaseproof paper.