When did you become a manager?
I joined a private investigation agency in 1953, and bought it two years later for £200. I was 25 and ambitious - I didn't have a holiday for my first 10 years. I built up a 30-strong firm and 10 years ago, at 65, I'd made all the money I wanted, so I sold it. I'm still trading in my own name as a PI.
What does management mean to you?
The chase may be thrilling, but I ensure my people obey speed limits and red lights. You also have to be able to delegate - I was never any good at that. A lot of people hire investigators to confirm what they think, and don't like the truth. I learnt the hard way to get the money upfront. I once applied to a management institute and they asked me to take an entrance test; I sent them my balance sheet instead. Now I'm a member. Nowadays, I work for pleasure, so if I'm reaching my client's budget I'll carry on and swallow the expense. That's no way to run a business.