Children of Men was a bleak, near-future thriller directed by Alfonso Cuarón, starring Clive Owen, Michael Caine, Chiwetel Ejiofor and Julianne Moore.

The film relied heavily on long, continuous takes, which made the practical effects work especially demanding. Bullet hits, explosions, vehicle effects and debris all had to happen at exactly the right moment, often with no opportunity to hide a reset or cut away.

The famous car sequence was a perfect example. With the camera moving continuously through the vehicle, every effect, stunt and performance cue had to be timed precisely. If one element missed, the whole take was compromised. It was technically demanding work, but that precision is a big part of why the film still feels so immediate and real.

Alfonso also had a directing style I hadn't encountered before. During some freezing, wet night shoots at a girls' school around the Abbots Langley area, I remember the cast and supporting artists being kept outside for hours while Alfonso remained in his warm trailer. He would eventually come out when he felt the moment was right to shoot — by which point everybody genuinely looked absolutely frozen, because they were. Whether you agreed with the method or not, the exhaustion and discomfort were clearly evident on camera.

It was a fascinating production to be part of and a real lesson in how camera, performance, stunts and practical effects can all be choreographed together, particularly when the director is determined to keep the camera rolling rather than rely on conventional coverage and editing.