100²µ/3Β½΄Η³ϊ blueberry jam
180g/6oz fresh blueberries
1 lemon, zest only
Β½ lemon, zest only
1 tsp baking powder
45²µ/1Β½΄Η³ϊ caster sugar
pinch salt
350g/12oz self-raising flour, sifted, plus a little extra for dusting
1 tsp vanilla bean paste
85g/3oz unsalted butter, softened
2 x 227g tubs clotted cream
175ml/6fl oz full-fat milk, at room temperature