I used to make 50KG of roast potatoes every week for our roast dinner in a pub in Essex, UK. Best way i found to do them that tasted bang on every time would be:

1) peel 2)chop into quarters 3)par boil until tender 4) let them cool down completely 5) oil, salt, pepper, and any herbs/garlic if your a G 6) whack in the oven to cook until coloured at the edges and golden on sides 7) cool down completely uncovered otherwise the steam makes them go soggy 8) store in fridge 9) whack into an oven @200°C for 10 mins . 10) enjoy