Brighton sandwich

This is one of my favourite treats and an old family recipe
It really is yummy.

Brighton Sandwich
Ingredients:
8 oz Self raising flour
2 oz caster sugar
2 oz butter
1 egg
2 oz trex
drop of milk
Method:
Heat over to 220°c 425°f, gas 7. Crumble fat into dry ingredients, add the egg and drop of milk (approx 1 tablespoon). Bind into a dough and divide into two. Roll our half (1/2? thick) and place on a baking sheet. Brush edges with milk and cover the centre with seedless raspberry jam. Roll out the other half of the dough and cover the jam, seal the edges and prick all over with a fork. Brush with milk and sprinkle with caster sugar. Bake for 12-15 minutes.