Kirsty Young's castaway this week is the designer Celia Birtwell.

In the ephemeral world of fashion she has endured; Marian Faithfull wore her creations in the 60s, Kate Moss is a fan today. Whimsical prints and flattering forms are her signature style and the vintage creations that she designed with her then husband Ossie Clarke now change hands for a small fortune. Her new ranges are highly collectable and fly off the high street rails too.

Never one of the fashion world's flamboyant self promoters she has, none the less, a face known to millions - as a long time friend and muse to David Hockney she is the woman at the centre of his famous painting "Mr and Mrs Clark and Percy".

She wants her work to be relevant because and says "there's nothing worse than being out-dated. If that happens and I feel I'm past it, I'll stop".

Producer: Cathy Drysdale.