Once the milk butter mixture is cool enough to handle, add the beaten egg along with your dry ingredient mix. Don't be afraid to use your hands to mix the dough well.
Add the orange zest, apple, cinnamon and raisins. Mix well and roll the resulting dough into your buns.
For the crosses, mix the flour with just enough water to make a paste. Then, using a piping bag or your hands, lay the cross out on top of your risen buns.
Preheat the oven to 200°C before putting the hot cross buns in to bake for about 20 minutes.