Heat oven to 220C/fan 200C/gas 7.

Tip 350g self-raising flour into a large bowl with ¼ tsp salt and 1 tsp baking powder, then mix.

Add 85g butter cubes, then rub in with your fingers until the mix looks like fine crumbs then stir in 3 tbsp caster sugar.

Put 175ml milk into a jug and heat in the microwave for about 30 secs until warm, but not hot.

Add 1 tsp vanilla extract and a squeeze of lemon juice, then set aside for a moment.

Put a baking sheet in the oven.

Make a well in the dry mix,