with strips of cling film (using a little water to help the cling film stick) and then line the base with a disc of baking paper.
2. first make the pie base. place the biscuits in a freezer bag and finely crush with a rolling pin. melt the butter in a non-stick saucepan over a low heat, add the biscuits and combine. spoon into the base of the tin, pressing down with the back of the spoon to level. chill for 15 minutes.
3. to make the filling, heat the butter and sugar in the same pan and stir over a low heat until combined. add the condensed milk and bring to 