Have to agree with 16B, the time to stage his little protest was before the UNSCR authorised the UK presence under UN Security Council Resolution 1483. It was passed in May 2003.
http://www.globalpolicy.org/security...resolution.htm
Not that I think he's case had any merit before then, but to try-it on now looks like column-dodging, If he feels so strongly he can do his tour then leave.