It seems to be unravelling, there are now claims that the pig story was unsubstantiated, and he had never been a member of said club.
And how do these claims compare to the claims that he was, and that there is (at least) one photo which some people claim to have seen, and that the person who has the photo has been named?
There is certainly no doubt that he was in the Bullingdon, a bunch of braying ninnies overburdened with wealth, snobbery, excessive drinking, cocaine and wanton vandalism. Boris Johnson claims he left because they were drunken buffoons and too immature for him.