Did anyone notice that strange 4x4 parked in front of the William Hill by Forest Hill Station around noon on Friday, May 1st?

It was all black, with riot mesh protecting the windows. It had a 4-way video camera on the roof, plus a video camera in the front seat next to the driver, recording people walking by on the pavement. The operator was talking on his mobile like any old nonchalant public servant you'd see doing public works.

Signs on the side said "VIDEO SURVEILLANCE VEHICLE", and "WORKING IN PARTNERSHIP WITH THE POLICE". I rang the number on the side and got an operator for the "National Control Centre". Google produced no results, although it may be this:

http://www.highways.gov.uk/knowledge/1291.aspx

When I came back out of Sainsbury's about 15 minutes later it was gone. Sounds very Orwellian to me! My imagination runs wild. Any ideas?

Photos attached.