Preheat oven 200 degrees C, fan forced. Line large flat oven tray with baking paper.
Whisk 150ml milk, the cream and egg together until well combined. Combine flour, sugar, dates and lemon rind in a large bowl. Add milk mixture and stir gently to a soft dough, adding remaining milk if necessary. Turn onto a lightly floured surface and knead gently until dough comes together.
Press dough out to 2cm thick. Cut scones from dough and place onto tray flat-side up. Press dough together gently and repeat using the remaining dough. Brush the tops with milk and sprinkle with a little sugar. Bake 12-15 minutes until golden and well risen. Serve hot with jam and cream.