War or at least the threat of war isn't
impossible but it's very, very unlikely simply because the British government didn't want the current bad relations with Iran and certainly doesn't want them to become much worse. It's interesting that it took this long for this claim to be made; I'm sure you can all draw your own conclusions from that.
Iran's response is interesting:
"This is a lie. The British are the cause of instability and crisis in Iraq.
"By drafting such scenarios they are trying to find a partner in their crimes."An absolute
classic of reply from that sort of regime; first accuse the accusers of "lying", second blame them for any problems in the area question and third, resort to paranoia and coded allegations of conspiracies against
them by the accusers.
I do sometimes wonder whether they use a sort of random insults generator to work out what to say in response to serious allegations against their regime...