If it makes you feel better, I got it! And although I'm not a big fan of personalised plates, I quite like that because no one will know it is personalised at first look, and only a few people who ever see it on the road will realise what it means. Was/Is your mini a J reg already? I know you can't legally make a car look newer than it is but you can put an older plate on it as long as you are honest when you sell it.
Yes, it actually does make me feel better

It was a L reg but there was only a few choices of letters to choose from and its not far off.