The photo was taken in a studio in Mombasa in 1953, and it was to go into his new passport. Previously, he hadn't had a passport even though he travelled widely both within East Africa and on the routes from Mombasa to England. He hadn't needed one: as a minor, he was included on both his mother and father's passports.
Some of the most difficult years of his life came immediately after that visit to the studio, for the separate passport had been needed so he could travel back and forth to England alone, this necessitated after his parents had decided to sent him to school in England, returning to his East African home for two months each (English) summer. This regime would continue until he was sixteen, after which his parents retired from East Africa and his holidays were centred on wherever they were living in England.
So, what advice would I have given myself? Perhaps it should have been something simple, like "Never tell a lie," because it has always seemed to me that lies are too often uncovered, at great cost. Yet something like that seems far too simple to be of much use. I think I would rather have urged the small boy to be true to himself, that is, to trust, in all the complex decisions in the life that stretched before him, in the small voice that is within all of us, the voice of, at the same time, one's conscience, one's gut instinct, one's guide.