From the BBC website:
Heard the one about...
Urban myth or terror warning? How David Blunkett took a tale of a rumoured attack straight to the top.
It is a story that has dropped in to many an e-mail in-box or been passed on by word-of-mouth. And its distribution has picked up in these times of heightened security since the 11 September and 7 July attacks.
The characters in the story and its location vary, but the plot stays mostly the same. It runs as follows:
"My friend's Aunt Sally was in a queue and this Middle Eastern-looking bloke in front of her dropped his wallet. When she gave it back to him, he told her to avoid central London on Saturday because something big might happen. Tell as many people as you can."
Most people sigh, and delete the e-mail.
But when this same tale crossed David Blunkett's path in late 2001, he passed it straight to the top.
An entry in his newly-published diary reveals how he had spoken to an old school friend, who had heard the story involving the return of a wallet to an Arab man and a warning not to be in London on 11 November.
"I immediately registered the significance of this," Blunkett wrote at the time. "The 11th of November is Armistice Day, the one day in the year when all leading politicians from the three parties, the Queen, other members of the Royal family, and the leading personnel of the armed services are in the same place at the same time - a known time, in central London.
"I decided that I should at least tell Tony Blair as it was absolutely clear that nobody had fully thought through the significance.
"We agreed there was no way we could possibly cancel Armistice Day, but we were certainly going to have to take increased precautions."
Then later: "Sunday 11th of November: And we've come through Remembrance Sunday safely. All the worry was for nothing, thank God."
full story
I know they can't take any chances but really... No suggestion even that there was any police inteligence about it!