I some... I remember something about Grierson which stuck with me all through my career really in that he described documentary as the dramatisation of reality and, of course, I spent all my early years in documentary, and then later on when I was to get into feature films, this... this sort of early training and appreciation of cinema was really to affect the work I did later on, this dramatisation of reality. But just to stay with British Transport Films for a bit longer, we... we also did films on the canals, on the narrow boats, in the early '50s and it was extraordinary how primitive things were, because very often these barges were horse drawn still and they had to negotiate tunnels and the only way to get through a tunnel sometimes was to... to lie on your back and push your feet against the roof of the tunnel, to push the boat through, and the... the conditions of these people living on these narrow boats was... was really very primitive; immensely hard work and I did a couple of films involving work on the canals.