Voluminous fringes and the 'up-do' were the must-have hairdos of London Fashion week. For 'up-do' read chignon, or hair-bun, anything in fact which keeps those irritating tresses out of your face. Although the hair-bun has a practical purpose, it is rich in symbolism with its suggestion of the librarian, the spinster or repressed woman who needs to find a way to let her hair down - and it is of course a major part of your life if you are a ballerina. Judy Merry went to find out more about the history of this perennially popular hairstyle and was allowed into the back-stage dressing room of the Northern Ballet.