PETER BROWN is the former COO of Apple Corp, the Beatles' financial empire. He's been a Beatles intimate since their earliest days in Liverpool. Their passports were locked in his desk drawer. He was best man at John and Yoko's wedding, he introduced Paul to Linda Eastman, and perhaps the most charming of his credentials is that he's the only real person ever mentioned in a Beatles song: 'Peter Brown called to say, you can make it okay, you can marry in Gibraltar near Spain' from 'The Ballad of John and Yoko'. Mr. Brown is now chairman of the international public relations firm of Brown Lloyd James LTD.