1. Preheat the oven to 160°C/fan 140°C/gas 3. Line two baking sheets with non-stick baking paper.
2. Measure the butter and sugar into a bowl and beat until smooth; then mix in the flour.
3. Roll out on a lightly floured work surface using a rolling pin until the dough is about 0.5cm (¼in) thick. Use your large cutter to cut out the shapes. If you have a small version of your chosen cutter use this to cut the middle out of each shape, otherwise do it by hand, leaving about 1cm (½in) of biscuit around the edge. Arrange on the baking sheets.
4.  Crush the boiled sweets using a rolling pin until they’re fine grains, and sprinkle these grains in the middle of each biscuit. 
5.Bake in the preheated oven for about 12-15 minutes or until the biscuits are a pale gold and the sweets inside them have  melted. Leave to stand on the trays for about 5 minutes to cool slightly, then carefully transfer to a wire rack and leave to cool completely and firm up.