Thanks to Chris and Alfonso who showed up. It was a full day of sketching, and as usual I felt that I walked too much and drew too little. The fact is that every location has something to offer, if you are open to it. Here are the results, starting with a little gouache study which I created while waiting to begin:
Rainy day tourists at the Tower of London:
Trafalgar Square and "Nando's" restaurant:
Tate Modern and Southwark Cathedral: