ALAN JONES found aha in the Yellow Pages when his first job after completing his sandwich course at Portsmouth fell through 20 years ago. After cutting his teeth on Inmos and Schlumberger - 'making the mast and cable stay practical' - he became a director in 1987, and was project director for Waterloo, Cambridge Law Faculty, Eden and Middleton Hall. 'When you sit down at computer you should know what you want,' he says. 'Computers are a way of making mistakes 1000 times faster than by hand.' He likes the challenge of new materials, and sees engineering as 'not knowing everything but knowing where to look'.