CARNABY STREET celebrates 30 years as the centre of fashion this Saturday with a street party. The street that is now a mecca for tourists looking for 'swinging London', was once the home of Lord Kitchener's Valet, kaftans and psychedelic shirts. There will be punks, mods, rockers and psychedelics on every corner. Hamburgers will be sold at 1974 prices and Cranks will have selected items at Sixties prices. The festival starts about 11am and continues until 7pm. For information, ring 071-434 0624.