Place a piece of baking paper on top of a sheet of foil both bigger than the top of the pudding basin by an extra 5cm. Holding them together fold a pleat in the centre to allow for expansion, then place baking paper side down on top of the basin. Tie under the rim of the basin with string and securely tie. Before cutting the string take it over the top and secure on the other side to form a handle. Trim any excess paper and foil.