Inventive engineer Bryn Bird is flying the nest, severing his full-time links with the practice he helped found, Whitby Bird & Partners. One reason is that he wants to spend more time with his ornithopter, the human-powered flying machine he has been developing, and to work on other patentable ideas. He has plenty up his sleeve, he says, some dating back to when he was 14; at 51 he believes it is now or never: 'I enjoy structural engineering, but there are other things in life.' The practice is now 180-strong and requires a considerable amount of management, which Bird does not enjoy, 'and I'm not very good at it'. Instead he will remain as a consultant, going in to the Allies & Morrison-designed offices two or three times a week. This should help to keep him fit since he regularly walks or cycles the five miles from his Rotherhithe home.