I am Scottish and Shep/pie or Cot/pie are very popular here is a very easy dish basically beef mince or lamb mince brown off with some diced onion most people and grated carrots and turnip add some stock cook well and thicken with flower and water add gravy browning or gravy salt season to taste let it cool and set in a casserole/pie dish.
Make your mash pots anyway you want as long as their soft and fluffy, you can pipe them on to the top of the mince or just spread them evenly on top and use your fork to make a nice pattern.(good tipis to mix an egg yolk and butter through your mashed potatoes, this gives a nice brown effect).

Put into oven within 30-34 minutes until well cooked and nicely browned. Serve with fish, peas or rough cut cabbage.