If so can you look at the recipe for roast lamb.
I know he sits it on a bed of rosemary and adds garlic. Covers it in foil and puts it in a pre-heated oven (the highest temp your oven goes to) and immediately turns it down to either 150 C or 170 C and I don't know which it is. He cooks it at this temp for 4 hours.
Please could you let me know what that temp is and what weight of lamb it is. Many thanks.