What is Operation IceBlue?

I've just been talking to a friend of mine who was stopped and searched under the Prevention of Terrorism Act 2000 and something called Operation IceBlue this morning at Charing Cross Station. Why was he stopped? Well, according to the ticket issued by armed police it was under:

Section 44(2) Terrorism Act 2000. Seen CX BR Stn, unshaven, sweating alot, waited for several trains to come and go without action.

Now let me add some context to this. My friend is on night shift at the moment, a fellow techie geek in fact. This morning he finished his shift and made his way to Charing Cross station to go home. He was running a little late and so had to run in order to catch his train but unfortunately he missed it. This meant waiting around at Charing Cross for about 30 minutes until the next train came along.

During this time he noticed an extremly high police presence, far greater than is normal. There were at least eight armed police carrying Heckler and Kock MP5's, plus sniffer dogs on all the exits. Having been to Charing Cross a few times myself in the past few weeks I have to say I've never seen that much security there, and to quote my friend it was "like an airport".

This leads me to wonder whether there was some sort of specific intelligence reason for their presence today? After all, why stop a a pale white guy in shorts and flip flops for being unshaven and sweating a bit after running into the station for a train? "Better safe than sorry" would be the argument I know, but there is a little bit of a cynic in me that wonders if he was stopped as part of a quota policy to avoid accusations of racial profiling.

Apparently when it comes to the ethnicity part of the ticket though, the police informed my friend they were not allowed to write it down anymore and the person being stopped must choose. That does still leave the question of what exactly Operation IceBlue is?

At the time of his search my friend was told that this sort of thing was happening at all train stations since 7/7 and that today just happened to be Charing Cross's turn in a normal routine. However, if that is true, then you'd have thought the term Operation IceBlue would be well known in the public domain, yet I can't find any obvious reference to it online. It's all very curious.