Traditional British Mini Chicken & Mushroom Pie

gr/ 14oz all purpose flour

gr/ 7oz cold butter, cut into chunks

salt

ml/ 3fl oz very cold water

gr/14oz chicken breast, cut into small cubes

gr/10oz chestnut mushrooms, sliced

leeks, finely sliced

butter, softened

all purpose flour

chicken stock

glass dry white wine

ml/3.5fl oz fresh double cream

Extravirgin olive oil

fresh thyme leaves

egg + 2 tbsp water whisked together, for brushing