Beat the butter and sugar until creamy in a food mixer
Beat in the black treacle
Scrape down the sides. Beat in milk and vanilla
In a separate bowl mix the flour, bread soda, salt and spices
With the mixer on low speed slowly mix into the wet ingredients until combined.
Divide the dough in half and wrap in clingfilm. Chill for at least three hours.
Preheat the oven to 180°C/350°F/Gas Mark 4
Line large baking trays with baking parchment
Flour the worktop and rolling pin. Roll out dough to ¼ inch thick. Cut out shapes and place one inch apart on baking tray
Bake cookies for 10 minutes. The cookies will be soft when you take them out but will crisp up as they cool
Allow to cool for 5 minutes on the tray then transfer to cooling rack. Decorate however you like