Your one street away, its by the waterside, the one right beside Coca-Cola London, the Road that runs by the waterside, the curvature of the road matches the photo of Big Ben etc
TRAFFIC CAM LIVE LINKS BELOW
These two are links of live trafficcam feeds from London, both situated on Victoria Embankment which is where Q's cam shot was taken (Facing South towards Big Ben).
http:// www. trafficdelays .co.uk/westminster-bridge-york-road-london-cctv-traffic-camera/
http:// www .trafficdelays. co.uk/northumberland-avenue-victoria-embankment-london-cctv-traffic-camera/
I believe these are cams to watch in the coming 6 hours atleast.