ST THOMAS' Hospital and Fortnum & Mason in Piccadilly join forces on Monday for a catwalk show to raise money for Tommy's Campaign, a charity that funds research into premature births. Jenny Agutter, among others, will model autumn collections by MaxMara, Amanda Wakeley and Edina Ronay. The organisers hope to raise pounds 10,000 for neonatal equipment, and Fortnum's will donate a percentage of the day's receipts to Tommy's Campaign. There are 250 tickets, at pounds 25 each, and a raffle will be held. For details, call 071-620 2654.