Step 1
To make the mango chutney, in a small saucepan over medium heat, combine the vinegar and sugar, stirring until sugar dissolves. Bring to the boil. Cook, without stirring, for 5 mins or until mixture reduces by half and thickens slightly. Stir in the mango and 1/2 tsp salt and return to a simmer. Cook, stirring occasionally, for a further 10 mins or until mango is translucent and mixture thickens. Stir in the cayenne pepper, if using. Transfer to a bowl and set aside to cool.
Step 2
Place rack in upper third of oven and preheat oven to 210°C (190°C fan-forced). In a large bowl, whisk the flour and 1 tsp salt. Using your fingers, rub butter into flour until the mixture resembles coarse breadcrumbs. Make a well in the centre of the flour mixture and add the buttermilk. Using a round-bladed knife, stir until the mixture is just evenly moistened. Turn the dough onto a lightly floured surface. Gently roll or press into a 1.5cm-thick disc.
Step 3
Using a lightly floured 4cm pastry cutter, cut discs from the dough, rerolling excess. (Alternatively, use a lightly floured knife to cut the dough into 4cm squares.)
Step 4
Arrange the scones side-by-side on a large baking tray, allowing room for spreading. Brush with extra buttermilk. Bake for 12 mins or until golden. Set aside on the tray for 10 mins to cool.
Step 5
Cut ham slices and fold in half. Split the scones. Place the scone bases on a serving platter and top with cheddar, ham and mango chutney. Top with scone tops.