It's not very long since respectable parents thought of fashion modelling as being a step on the road to ruin for their daughters. But the swinging 60s changed all that, and today there are over 80 model agencies in London alone - and a rash of model schools - which cater for the dreams of girls ambitious to earn fame and fortune with their figures. What is the truth? Man Alive looks at the chic fagade and the seamy side of the world where model girls are fashioned.