Sorry, Boys, You Failed The Audition

On January 30, 1969, John Lennon ended the Beatles' filmed concert on the roof of their Apple headquarters in London by joking 'Thank you very much. We hope we passed the audition' It was the last time the four would be seen playing together.
But what would have happened if six and a half years earlier, in the summer of 1962, the Beatles hadn't impressed at their all-important last chance to sign a record deal with Parlophone? What would the future have held for John, Paul, George and Ringo if producer George Martin had said 'No'? A 'what if' novella.