The real question to be asked is not whether the British sailors were in Iranian or Iraqi waters. The real question is who benefits from this "provocation". The incident would seem to fit in well with the plans that imperialism has to strike at Iran's nuclear development plan.
The Pentagon is continuing intensive planning for a possible bombing attack on Iran. These preparations began already last year, by order of the President. In other words, the decision has already been arrived at. All that Bush is waiting for is a suitable opportunity to put it into practice.