1. Season the pork loin roast with salt and pepper.

2. Heat oil in a pan and brown the pork loin roast on all sides until golden brown.

3. Place the pork loin roast in a roasting pan and roast in a preheated oven at 180 degrees Celsius for about 1 hour, or until it reaches an internal temperature of 63 degrees Celsius.

4. While the roast is in the oven, peel and cut the potatoes into equal-sized pieces.

5. Place the potato pieces in a pot of boiling water and cook for about 15-20 minutes, or until tender.

6. Drain the cooked potatoes and return them to the pot.

7. Add the milk and cream to the potatoes and mash with a potato masher or fork until creamy.

8. Season with salt and pepper.

9. Remove the finished pork loin roast from the oven and let it rest for about 10 minutes.

10. Transfer the pan juices from the roasting pan to a small saucepan and bring to a boil.

11. Pour the pan juices over the pork loin roast and serve.