Where can you get "Prime Rib of Beef" in London ?

Wher can you get that magnificent American cut of beef "Prime Rib" in London? I have been told that British butchers cut the animal in a different way from American so the "Prime Rib" cut (usually on the bone) isn’t avialable. Anyobe know a restaurant where it is?
Malta

Thanks for your answer. I agree. Perhaps those who think that it is obtainable don’t quite know what it is! Anyone out there – please help!!
Prime Rib to me is not really conventionally "steak". There is a good desciption of it on Wikipedia:

http://en.wikipedia.org/wiki/Prime_Rib

OK – over to you all again. Wher can I get it in London??!!
10 points up for grabs! So far the recommendations have drawn a blank. The restaurants suggested don’t do Prime Rib. The butcher recommendation was good – but I don’t want to cook myslef! I want a good chef in a good restaurant to do me a Prime Rib !

Try the oldest pub/restaurant in London – Rules – went there the other day and my friend had Rib of Beef – looked spectacular!!! Comes with Yorkshire pud and creamed horseraddish!