"My mind drifted back to the winter of 1968 at St Marks Primary School in Jersey. The Railway Children dramatisation had recently been screened and was very much the talk of my class. One day a teacher walked around the room asking, 'What do you want to be when you grow up?' The usual answers flowed: doctor, nurse, pilot, astronaut, scientist and then suddenly it was my turn. 'I want to be Jenny Agutter'. The teacher smiled a little quizzically...