Gareth Keenan: I did learn a lot from David. I learnt from his mistakes. We're very different people; he used humour where I use discipline. And I learnt that nobody respects him. And in a war situation, if you want your platoon to go over the top with you to certain death, it's no good saying to them 'Please come with me lads, I'll tell you a joke.' It's a direct order 'Come with me.' And they'll go 'Yes, he's got good leadership skills, let's all go with him to our certain death'. Also, if you're laughing in the jungle, you can give away your position to the enemy.