Mix the first lot of flour, yeast, sugar and salt in a bowl and mix.

Add the cold water, then the boiling water and mix until smooth. Leave for 2 - 3 minutes.

Add the second lot of flour, the cinnamon and mixed spice. Mix, then add the sultanas.

Knead for 5 minutes until the dough is smooth.  Keep sprinkling flour on the dough if it is sticky.

Put a clean tea-towel over the bowl and leave on the bench for 15 minutes.

Line two trays with baking paper, then break off pieces of dough approximately the size of an egg. Roll them into balls and place them on the trays, spacing them so that there is room for them to expand.

Heat the oven to  200ºC (375ºF).  If you would like the buns to be shiney on top, brush them with milk. To make the crosses, put 2 tbsp of flour into a cup.  Dribble water in and stir until a thick paste forms.  Use a piping bag or the side of a teaspoon to draw the crosses on top of each bun.

Bake for 15 - 20 minutes until the tops of the buns are golden-brown.