Sadly we dont have one here in the UK. However much crap our "Leaders" spout about just wars, international security and defending our interests, I believe the majority of the voicless voters who actually put these idiots in charge dont want an oil war any more than the French and German public. We are not represented by government.

We, the People of Britain, are essentially powerless.
Britain is now a military dictatorship, with Her foreign
policy administered almost entirely from Washington.

Calls have been made for there to be a General Strike but that is about as 'heavy' as it gets. It looks likely that
even a General Strike would be unlikely to sway Blair.
Is he being blackmailed?

There are people calling for Blair, if he declares war
without a UN approval, to handed over to the International Criminal Court for trial as a War Criminal. According to the news reports this is a scenario which even he must recognise as a distinct possibility.

"Professor of International Law, Francis A. Boyle
of the University of Illinois says that waging a
war of aggression is a war crime under the
Nuremberg Charter, Judgment and Principles."

 http://www.fromthewilderness.com/free/ww3/011303_preemptive.html

"Lord Goldsmith, [Britain's] Attorney General, and
Harriet Harman, Solicitor General, have warned
the Government that if it attacked Iraq without
the backing of a UN Resolution action then it
could find itself hauled before the ICC."

 http://www.telegraph.co.uk/news/main.jhtml?xml=/news/2002/11/06/nirq06.xml

"It would be a breach of the Security Council
resolution (on weapons inspections) for there to
be an attack on Iraq without United Nations
support and in those circumstances, a breach of
the charter of the UN and would expose..'personnel'
to possible challenges in the international courts,"

 http://townsvillebulletin.news.com.au/common/story_page/0,7034,5883543%255E421,00.html