The visual group is based in the Malet Place Engineering Building (MPEB) on the main Bloomsbury campus of UCL. Most of us are located on the 6th floor, but if you have not visited before, it is best to report to the computer science reception on the 5th floor first. A map and instructions can be found here.
Here is a brief verbal description of how to find us. The two closest tube stations are Euston Square and Goodge St. First get to Waterstones on Gower St. If you are at Euston Square, walk South along Gower St until you see Waterstones (Gower St is a one way street - south is following the traffic). If you are at Goodge Street, walk north along Tottenham Court Road (i.e. following traffic) then turn right (east) in to Torrington Place and walk (against the traffic) until you see Waterstones . If you are standing infront of the main facade of Waterstones, look away from Waterstones (north), and facing you is Engineering Front Building (EFB). The entrance for visitors to MPEB is through EFB, ask the security desk (door to the right of the building as you face the buildig) to direct you to the Computer Science reception.