Thanks to Chris and Alfonso who showed up. We followed a route from St. James's Park through Trafalgar Square, across the river to Festival Hall, then to the Tower via the tube, across Tower Bridge, past City Hall and Borough Market to the Tate Modern. It was a long day. I put together a map (http://tinyurl.com/2nynfv) which we ended up following pretty closely.
Here's a little gouache study in St James's park which I did while waiting to begin:
![Image](http://www.tomdow.com/media2/sketchbook_290308.1.jpg)
Rainy day tourists at the Tower of London:
![Image](http://www.tomdow.com/media2/sketchbook_290308.2.jpg)
Trafalgar Square and "Nando's" restaurant:
![Image](http://www.tomdow.com/media2/sketchbook_290308.3.jpg)
Tate Modern and Southwark Cathedral:
![Image](http://www.tomdow.com/media2/sketchbook_290308.4.jpg)