For hot water pastry, bring water and butter to the boil in small saucepan then add to processor with the flour; process until ingredients come together. Knead dough on floured surface until smooth. Cover; refrigerate 30 minutes.
2 For the jelly, bring chicken stock and the water to the boil in small saucepan. Remove from heat; stir in gelatine until dissolved.
3 Preheat oven to 220°C/425°F. Grease 20cm (8 inch) round spring form tin.
4 Combine pork, bacon, herbs, spices and anchovy in large bowl.
5 Roll two-thirds of the pastry on floured surface until large enough to line base and side of tin. Ease pastry into tin, press into side; trim edge, make sure there are no cracks in the pastry. Place tin on oven tray. Fill with pork mixture then pour over ¹/³ cup jelly; brush edge of pastry with egg. Roll remaining pastry to cover filling; pinch edge to seal. Cut 2.5cm (1 inch) circle from top of pie, discard circle; brush pastry top with egg.
6 Bake pie 30 minutes. Reduce heat to 200°C/400°F. Bake a further 1¼ hours. Cool.
7 Using a funnel, pour remaining slightly warmed jelly slowly into hole in pie. Cover, refrigerate overnight. Cut pie into wedges to serve.