Lobsterboy, my apology, I didn't know that the "private" dining clubs in London had been closed.
mkg, you keep trying to throw the discrimination thing at me and I keep telling you "horse feathers"! You discriminate every time you chose one person as a friend and reject another and that, certainly, is not against any law in this country.
As to your question about the "correct answer" concerning the legality of a private club to stipulate qualifications for its membership - whether you like it or not, the answer is "Yes" it is legal.
If you are asking is this right - I've already said that I do not think so but it is "None of my beeswax".
In this country, we are free to choose with whom we associate - how can I possibly be any clearer?