Is he an adrenaline junkie? Well, partly, perhaps. But he also famously drives an ancient Volvo and thinks the wisest thing he's ever done is put money into a pension fund. And his next BBC project, on foundlings, explores his sensitive side, focusing on Baby William, dumped in a binliner on an allotment in Oxford last year, and David, who was abandoned in Ireland in 1962 and still hopes to find his mother. 'It's such an extraordinarily Victorian crime, to abandon a child,' Donal reflects. 'It runs so counter to what nature tells us. My mother is an extraordinary woman who brought up five children and had extraordinary reserves of energy and tolerance, and the contribution that she made to our lives was enormous. I suppose I wanted to find out what life is like without that kind of input.'