Here are my recommendations.
Past Imperfect by Joan Collins is extremely interesting, if you can still buy it.
The Insider by Piers Morgan. All about his life as the News of the World and then Mirror editor, refreshingly honest and very funny.
Stop the Ride by Dave Courtney. He is a celebrity gangster and once you get over the swearing in the book, I would definately say this is the funniest book I have read in my whole life. Once I had read it, it got passed around the whole office and everyone, old and young alike enjoyed it.
The book by Paul Whatisname, Princess Di's butler is very good and makes for surprising reading.
If you can get hold of it, Stick it Up Your Punter, The Rise and Fall of the Sun newspaper is also very interesting. Look on Abe booksite, but don't pay Amazon's exhorbitant prices.
Max Cliffords biography is okay, lots of spin, but that is what you would expect of course!
Sharon Osborne's book was for me surprisingly disappointing for such a seemingly warm and funny person.
That is all I can think of for now!
Cheers Sue