01 - In a large bowl, combine flour, caster sugar, mixed spice, cinnamon, nutmeg, salt, and yeast. Place salt and yeast on opposite sides of the bowl to prevent yeast inhibition.
02 - Add softened butter, lukewarm milk, and egg to the dry ingredients. Mix thoroughly to form a soft, slightly sticky dough that holds together.
03 - Turn dough onto a lightly floured surface and knead for 8-10 minutes until smooth, elastic, and no longer sticky. The dough should bounce back when pressed.
04 - Place dough in a greased bowl, cover with plastic wrap or a damp towel, and let rise in a warm, draft-free area for approximately 1 hour until doubled in size.
05 - Punch down risen dough to release air. Knead in currants, mixed peel, and orange zest until evenly distributed throughout the dough.
06 - Divide dough into 12 equal portions. Shape each piece into a smooth ball by tucking edges underneath. Arrange on a lined baking sheet with slight spacing between buns.
07 - Cover loosely with oiled plastic wrap and let rise for 45-60 minutes until puffed and buns are just touching each other.
08 - Preheat oven to 400°F.
09 - Mix flour and water to create a thick, smooth paste. Transfer to a piping bag or zip-top bag with corner snipped.
10 - Pipe a cross shape over each risen bun using the flour paste. Work quickly and steadily to maintain clean lines.
11 - Bake for 20-25 minutes until golden brown on top and buns sound hollow when tapped on the bottom.
12 - Warm apricot jam gently until pourable. Brush over hot buns immediately for a glossy finish. Transfer to wire rack and cool completely before serving.