This is an interesting piece by Craig Murray former British Ambassador to Central Asia:
" Let me quote, for example, from that well known far left source Stars and Stripes magazine, October 24 2006.
'Bumping into the Iranians can’t be helped in the northern Persian Gulf, where the lines between Iraqi and Iranian territorial water are blurred, officials said.
"No maritime border has been agreed upon by the two countries," Lockwood said.'That is Royal Australian Navy Commodore Peter Lockwood. He is the Commander of the Combined Task Force in the Northern Persian Gulf.
I might even know something about it myself, having been Head of the Maritime Section of the Foreign and Commonwealth Office from 1989 to 1992, and having been personally responsible in the Embargo Surveillance Centre for getting individual real time clearance for the Royal Navy to board specific vessels in these waters. "