01 - In a large bowl, combine the flour, sugar, salt, mixed spice, and cinnamon. Add yeast to one side of the bowl and salt to the opposite side to prevent yeast inhibition.
02 - Add softened butter, lukewarm milk, and egg to the dry ingredients. Mix thoroughly until a soft, sticky dough forms.
03 - Knead by hand on a lightly floured surface or with a stand mixer using dough hook for 10 minutes until smooth, elastic, and passes the windowpane test.
04 - Place dough in a lightly oiled bowl, cover with plastic wrap or damp cloth, and let rise in a warm, draft-free area for 1 hour or until doubled in volume.
05 - Punch down risen dough to release air. Turn onto floured surface and knead in currants, candied peel, and orange zest until evenly distributed throughout the dough.
06 - Divide dough into 12 equal portions. Shape each into a smooth, tight ball and place on parchment-lined baking sheet, spacing 2 inches apart to allow for expansion.
07 - Cover loosely with clean kitchen towel and let rise for 45 minutes until puffed and nearly doubled in size.
08 - Preheat oven to 400°F.
09 - Whisk together plain flour and water to create a thick, pipeable paste. Transfer to piping bag or zip-top bag with corner snipped.
10 - Pipe a cross shape over each bun, using steady pressure to create clean lines.
11 - Bake for 20-25 minutes until golden brown on top and sound hollow when tapped on the bottom.
12 - Warm apricot jam until liquid and brush generously over hot buns. Transfer to wire rack and cool completely before serving.