Terry O'Neill photographed Brigitte Bardot over several years, but the images that define the series were made on location in Spain in 1971, during the filming of Les Pétroleuses. Bardot was playing an outlaw - leather-clad, gun holstered, cigar in hand - and O'Neill was watching, waiting.

"I noticed that when the wind gusted there was potential for a great picture," he said. "When the time came, I only had a few frames left. But suddenly the wind swept her hair across her face, and I knew it was a knock-out."

That instinct - patience, timing, the knowledge of when to fire - is what separated O'Neill's work from the controlled celebrity photography of the era. What he captured that day wasn't a performance. It was a moment.