Just to add my two-pennyworth to the DA controversy!
I am so glad that, on the balance of evidence, it seems very unlikely that St David was rude and boorish at the RA. I have heard lots about him over the years, and all of it has been good.
I would also hope it wasn't his brother Richard. Again, I know people who knew him and he was always a sweetie, if not a darling.
Of course, we can never know for certain, but I find it very difficult to believe that these two high-achieving and well-brought up brothers would behave in such a cheap and tacky way - apart from anything else, risking their high reputations. So that's what I'm going to believe!!
It's so easy for these stories to get around and sometimes people are mistaken - they get names etc confused. Someone once told me a long story about Jeremy Clarkson, which amazed me (he was apparently very quiet, modest, humble and incredibly interested in his daughter's violin studies). It was only by chance that the person suddenly realised they meant Jeremy Paxman!!!