Another possibility is that the song is about a falling out with McCartney's long time publicist of 15 years Geoff Baker, who Paul fired sometime around 2005. It was rumored that Baker was writing a tell-all book about McCartney, and Paul felt betrayed. It's worth noting that Peter Brown, the Executive Director of NEMS Enterprises (The Beatles' management company), also wrote a tell-all about The Beatles and was banished from any contact with them. Peter Brown was such a close friend that John Lennon mentioned him by name in the song "The Ballad Of John And Yoko."
Mike - Westerville, OH