Thanks Guys,
They stopped us as we approached the underpass (we were going to platform 1). They gave a friendly blurb about "we are here to discourage terrorist activity" and gave me a sheet of information on the anti terrorist act. Apparently they want to deter people who might be thinking about carrying a bomb around in their bag, and if the potential bomber thinks there is a chance of stop and search he wont carry a bomb. It didn't dawn on me that it was stop and search, it was more can we take a few details, I said, yes sure. Then she wrote down my description, name dob and looked in my bag - to give the WPC her due she wasn't interested in looking in my bag. I feel pretty niave I just wasn't expecting that. A guy at my work said he was stopped before and he fits "the profile" male, between 25 - 40 and carrying a backpack. Probably my husband fits the bill - plus he's asian! So I was stopped with him. I am not chuffed I don't want my details on police records.
Be warned, if they stop you in a friendly can we have a few moments style, you are being searched and your details noted - plus you might miss your train!