Exam revision - the search continues

Sir David Attenborough has been given one of his most difficult assignments - to capture on film for the first time a teenager in the act of revising for his A-level examinations.

His team (for Attenborough relies on other people to do the camera work) called the Donkins of Woking in early January to arrange a stakeout. A cameraman called Rod, set up his hide in the bedroom wardrobe of our 17-year-old son, George.

The first week passed uneventfully as Rod recorded hour upon hour of George, leaning back in front of his X-Box 360 playing Call of Duty. Sometimes he was joined by an older brother and they alternated play while one sat out the downtime on George's bed.

More footage was recorded of George on Facebook, George on YouTube, George instant-messaging friends, George texting messages on his mobile phone and George eating cereal piled high in bowls.

There was occasional film of George involved in angry exchanges with a parent, and George stamping around his room, pleading, often without success, for use of the car.

But footage of the revision remains elusive. After two weeks Rod has been relieved by another cameraman, Ron who seems equally dedicated to the cause.

Teams of studio producers have been scrutinising hours and days of footage for the slightest sign - there was a squeal of excitement when George was seen to log on to his school web site (checking the school closure notice after heavy snow), but so far, nothing.....