Don't take my word for it, why not pop along to this BBC page and watch Christine Pratt talking. She is the head of an anti-bullying charity and states that three or four calls have been made to the National Bullying Helpline in recent years from staff who are "working directly with him" and that they "have issues and have concerns"..
She continues by saying that statements from people like Mandelson categorically denying that it was occurring is a nonsense and is not credible and what they should be doing is addressing it in more productive manner. To deny it is to compound the stress of those who believe they are being bullied. To outright deny it is not conducive to productive working relationships.
So there you have it, Brown is in denial and his cabinet colleagues are prepared to lie to cover up his indiscretions to help keep him as PM despite the fact he is clearly does not have the mental character necessary to hold such high office.
If you work for Gordon Brown and you too would like to talk to someone, you can also contact the National Bullying Hotline on 0845 22 55 787. Lines are open Monday to Friday 10am - 4pm and Saturdays 10am - 2pm.