"English" Alan Styles, a one-time member of the Sausalito anchor-out community and former roadie for the British rock band Pink Floyd, died Thursday of pneumonia at Marin General Hospital. He was 75. While his long hair, beard and giving manner made him a familiar figure around Sausalito, Mr. Styles was better known to millions as the voice on ''Alan's Psychedelic Breakfast," the track on Pink Floyd's 1970 album ''Atom Heart Mother." Born in Cambridge, England on Oct. 5, 1936, Mr. Styles became acquainted with David Gilmour during his youth. Gilmour would later become a guitarist and songwriter for Pink Floyd....