Mix the sugar, syrup, spices and egg in a jug. Tip the bicarb and flour into a bowl and add the butter stir it through the flour and then rub it in more thoroughly until it looks like breadcrumbs. Add the contents of the jug and a pinch of salt and stir the mixture to combine it. Use your hands to bring the dough together and then knead it until it is smooth. Divide the dough into 4 and press each batch into a disc. Slide them into plastic bags and chill for at least an hour.
Let them stiffen for 5 minutes before moving them to a cold surface. Keep rolling, cutting and baking until you have 24 or 25 biscuits (you may have more dough than you need but you can always freeze this for another time).
Put both into piping bags fitted with small nozzles. Thin the next two batches in the same way, this time the icing should flow like honey, add red colouring to one, you can put these into piping bags with fatter nozzles or squeezy bottles to fill in the outlines.