But Alexander Mackendrick's account (from Wikpedia, with no source given) of the making of Sammy Going South suggests that Fergus McClelland didn't just get too well fed but too happy.
"He was a lean, hard, little boy. Tough as old nails ... a really strong character. He had the hunted look of an abused child, which in some ways he was. He came from a disturbed home; his parents were getting divorced and there were problems. So he was the perfect casting.
"But when he went out to Africa, he started having the time of his life. The unit adored him and, to my dismay, started to feed him ... he put on weight and there was no way I could stop it. So, instead of this hunted and abused child, who’s supposed to be starving and neurotic, you had a sturdy, stocky, well fed little character. A good actor, but the physique betrayed itself."
McClelland talked about his experience of making the film in an interview with Matthew Sweet for BBC Radio 4's The Film Programme in 2010 – it begins at 24:14 – confirming much of what Mackendrick said.
Fascinating as child actors can be, it's hard to escape the feeling that there's something inherently exploitative about their employment.
Mackendrick made the film for Michael Balcon's Bryanston Film's – Balcon had been his boss at Ealing Studios. Mark Duguid has suggested:
Balcon saw the story as a heartwarming tale of a young innocent's triumph over adversity, against the fantastic scenery of the African continent. Characteristically, Mackendrick's understanding was altogether darker: he saw it as "the inward odyssey of a deeply disturbed child, who destroys everybody he comes up against".
Mackendrick's attempt to satisfy these two interpretations is probably the reason the film doesn't quite succeed.
A motif Mackendrick's was innocent characters who caused chaos and destruction – think of Mrs Wilberforce in The Ladykillers – so it's no surprise he was attracted to W.T. Canaway's original novel. Ironically, you could say the book managed to strike the balance between his and Balcon's ambitions that the film failed to find.
The original cut produced by Mackendrick was severely trimmed before release, and cut again for the US market. There it was given the ludicrous title A Boy Ten Feet Tall, apparently because it was feared white audiences would assume a film called Sammy Going South was about a black boy and stay away.
Sammy Going South is worth watching for its rare reference to the Suez Crisis in British films or novels and for about the last treatment in a film of British colonial Africa. Sammy's parents are killed in a British raid on Port Said, and he sets out to walk to the only other relative he knows, who lives in Durban in South Africa.
And Fergus McClelland's Sammy makes a credible and winning protagonist, even if Mackendrick was right to despair that he looks healthier and happier as his trek goes on.
