In a large bowl, mix the flour, yeast, salt, and caster sugar. Make a well in the center.

Whisk the warm milk, melted butter, and egg together in a jug, then pour into the dry ingredients.

Mix until a rough dough forms, then knead on a floured surface for 10 minutes until smooth and elastic.

Place the dough in a lightly oiled bowl, cover with a cloth, and leave to rise in a warm place for about 1 hour or until doubled in size.

While the dough rises, toss the diced apples with the ground cinnamon in a small bowl.

Punch down the risen dough and roll it out on a floured surface into a rectangle approximately 12 x 9 inches.

Spread 100g of the salted caramel sauce evenly over the dough, leaving a small border at the top edge, and scatter the spiced apples on top.

Roll the dough up tightly from the long edge closest to you. Cut into 9 equal slices.

Arrange the slices (cut side up) in a greased square baking tin (approx 20cm/8in), cover, and let prove for another 30 minutes.

Preheat the oven to 190°C (375°F).

Bake the buns for 20-25 minutes until golden brown and risen.

Remove from the oven and immediately brush or drizzle the remaining salted caramel sauce over the hot buns before serving.