At about 28:59 minutes, although the postcode ('SE1 5CC') shown on the computer monitor doesn't factually exist, the approximate co-ordinates given for Alex's (Otto Farrant) location do ('51.49276, -0.08015'). When using these co-ordinates, this gives Alex's location as near the Royal Mail Southwark & Rotherhithe Delivery Office, Mandela Way, London, SE1 5YP.