It looks to be a Clubman and possibly RRA. This will be a beauty and can't wait for one of the pro's to chime in. I have some ideas but will keep my mouth shut for now. I recently picked up a Clubman that appears 51'.

Mine was a frankenbuild, but the guy I bought from recently contacted me as he had some other parts he found that went with it and he forgot to include. So I now have calipers and crank for a Clubman. I can look at/post the calipers later if no one has ID'd.