I was down in London yesterday - and stopped in the Museum of London. I'm so excited - I bought the report entitled "The royal palace, abbey and town of Westminster on Thorney Island: Archaeological excavations (1991-8) for the London Underground Limited Jubilee Extension Project". A bit of a mouthful, but what a find. It has maps of the area from prehistory to the modern day. It is possible (thanks to photocopying onto transparencies) to compare each period with the modern streets and buildings. It gives such an insight into the way the area developed (and why).
I hope to share some of the findings over coming weeks.