forgot to mention that I did do some exercise yesterday. Rather than get the tube, I did some walking round the streets of London (all together now... so how can you tell me you're lo-oh-nley...), probably about 30 mins worth in all. Incidentally popout maps are fab. I use the central London one a lot, to see if things are walkable. Going everywhere by tube does rather distort one's view of London's geography.