People keep blaming the media, but I think they are wrong. The media usually turn a blind eye to these things and never inform the public. Remember Mr. Integrity? There were reports that it was common knowledge in Westminster circles, and yet we still had some of his closest friends and ex-politicians saying they had no knowledge of it. Ted Heath, was similar. The media didn't pry into his private life, and yet later a politician came out and said it was common knowledge in Westminster.
I think the media was forced to shine a light on this situation, because the conservative blogger, Guido Fawkes, had brought it up. The media couldn't ignore it, because Guido has many thousands of politically aware and possibly influential Tory readers.