SLOW Street-O in Chelsea and Battersea. The River Thames bisected the map, with a choice of three bridges to cross it, and Battersea Park formed the map's south-east quadrant. The start/finish was in the north-east corner.
Concentrated on picking off the control-rich Chelsea, before crossing the river and sweeping southwards. I started to run out of time as I entered Battersea Park, so wasn't able to get many controls in this part of the map, before needed to dash back across Chelsea Bridge, to the start.
Got stuck waiting for traffic to clear in Sloane Square, near the start, and more importantly when recrossing the Embankment right at the end - both times, I wasted a minute. Got a 4-point penalty for being 12s back, so finished with 656 points - fourth place. I would have been third equal, with an extra 3 points for the series scores, if I hadn't been held up! Ed scored 730, narrowly beating Matthias on 710.
My route (anticlockwise):
Technical note: There is no significance in the spacing between the black dots - these are just an artifact of the method I've used to create this image, and correspond to OpenStreetMap nodes passed on the way. I wanted to use my GPS track, but there are too many large errors early on due to weak reception, so I recreated the track using BikeRouteToaster, uploaded in to OSM and then used OJW's Static Map API to create the image.