Surveying Van in the UK

Seen today on the A27 in Portsmouth: a white American (I think) van with “Surveying” written on the front and a LOT of external gadgets and antennae. I’d love to think they’re doing Google Street View UK. Didn’t see anything that looked specifically like a set of cameras on top, although there was a large unit housing something or other on the roof. Unfortunately my view was limited to glances in the rear view mirror while trying to get through the roadworks and narrow lanes, and it turned off onto Eastern Road. In all probability it was a private survey using expensive imported kit, but it’s nice to think that my grotty old Passat might one day make its way onto Google Maps.