Chicken and leek pie

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Ingredients

• 500 gboneless chicken thigh fillets, cut into 2 cm pieces
• 300 gleeks, trimmed, washed and sliced
• 30 gbutter
• 30 gplain flour
• 300 mlchicken stock
• 100 mldouble cream
• 1 tspDijon mustard
• 320 gready-rolled puff pastry
• 1egg, beaten
• ½ tspdried thyme
• ¼ tspsalt
• ¼ tspblack pepper