Although nobody asked; Hilditch, how did you get that prime rib cooked so evenly from the center to the edges? I’m going to tell you anyway. Reverse sear.
It was roasted at 200° F until the temperature in the center of the roast was desired for the final temperature, MINUS 8 or 9° - about 1 1/2 hours. The above came out at 111°. It was then put on a platter to rest, during which time the temperature went up 8 or 9 ° - about 1/2 hour. When the temperature started to drop it is time to put it back in the oven for 8 or 9 minutes at 450° to sear. It can then be sliced immediately without resting again. Note that initial searing will end up overcooking the outer 1”, at least, rather than the preferred doneness all the way out to the edge.
Bonus: After resting the roast can be put into a 155° ‘ish oven and held at the desired temperature for 1 or 2 hours until just before time to serve. Some moisture in the oven during cooking or holding does not hurt.
Hilditch