You've a sporting chance of making a passable documentary if your subject is ready and willing to co-operate with the cameras. But if he isn't, what can the programme maker do? When producer David Jones and journalist fellow-traveller Kevin Page set out on their voyage of exploration, they had high hopes of tracking down their quarry. But in deciding to penetrate the world of the industrial and political lobbyist they have taken on an elusive and cunning animal. The lobbyist thrives on anonymity - his low profile is a sure means of defence as he goes about his work of influencing politicians and top civil servants. Show him a camera and he goes to earth. After 40 minutes of travelling hopefully neither Jones nor Page can be sure whether they have arrived - or whether they have simply shown that it takes two to tango.