Plot hole?
Enjoyed this movie. Great slice of 1970s nostalgia.
However, there is a plot problem. If the plan was to fake Tarrant's escape and then shoot him to prevent him talking and revealing that he had no connection to Drabble, why did they not just shoot the boy? Instead, they keep him alive in the windmill. What would be the point, as they already have the diamonds and the plan was for Tarrant to be dead anyway.