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The entrance hall leads to meeting rooms and the dining hall on the ground floor, which visitors do not need security clearance for. Visitors to the second and third floors (which include the antivirus labs) need clearance and must be accompanied by Sophos staff.
The secure area outside the antivirus labs. Devices with Internet access are barred from the labs, including Wi-Fi enabled laptops and 3G mobile phones. This is because they risk either infecting the closed networks within the labs, or being infected themselves by malicious code on the virus sample testing network.
Visitors must pass through two security gates to get to this point. There is still a third security gate restricting access to the labs.