I learn so much that I previously did not know about the world of the immobile that it is hard to believe it all takes place over a few hours. At random: I learn about the casual indifference of the London cabbie to the wheelchair user and that the clearance on accessible entrances is measured in millimetres less than a knuckle. I learn how intractable it is to push a grown man around for hours and how spontaneity is the privilege of the able-bodied. In solid counterpart to all this grief, I learn about the lengths nurses are prepared to go to assist a purely recreational and ambitious project by one of their patients.