British Chief Rabbi Jonathan Sacks apparently faces a possible defamation suit because his bet din doesn't recognize a woman named Helen Sagal's conversion and said she isn't Jewish. Apparently she was converetd by a bet din in Israel that is recognized by Rabbi Sacks' bet din. Don't know what the full story is or how it will develop. Link
Not knowing what the story is I don't know if the outcome could be a precedent for something bad or not.