...Imagine the surprise, then, of Jack Straw and his officials the following morning when they opened their newspapers to discover that the future constitutional arrangements for Iraq had been completely superseded by official British confirmation that Iran's Revolutionary Guards were behind the deadly attacks that have recently claimed the lives of eight British soldiers.

For the past two years it has been a Foreign Office mantra that not a word should be uttered that could in any way be construed as criticising the Iranian government. Having voiced his last-minute opposition to the invasion of Iraq, Mr Straw had taken it upon himself to find a "negotiated solution" to the West's stand-off with Teheran over its clandestine nuclear programme as an alternative to military confrontation.

Indeed, when The Sunday Telegraph two weeks ago revealed that agents working for the Revolutionary Guards had linked up with the Iraqi groups responsible for the attacks on British troops, the Foreign Office continued to insist that there was no firm evidence.

But now the cat is out of the bag. Not realising the sensitivity that Mr Straw attaches to Britain's dealings with Teheran, the unfortunate diplomat unwittingly strayed from his referendum brief and started laying into the Iranians with a gusto not seen in the British diplomatic service for decades...