Break the biscuits into small pieces, think postage stamp size, then gently fold the biscuit pieces into the chocolate mixture so everything is coated.
Warm the heavy cream, by microwave. Add the chocolate pieces to a bowl then add the warm cream and golden syrup. Let sit for five minutes then whisk to combine.
Place a plate under the wire rack to catch the drippings of the chocolate. Gently pour the chocolate ganache over the cake and use an angled spatula to help cover the sides.