speak to doug maclean, retired air traffic control manager. thank you very much for being on the programme. very much for being on the programme- very much for being on the programme. very much for being on the rouramme. ., m programme. you re welcome. what you think has gone programme. you re welcome. what you think has gone wrong programme. you re welcome. what you think has gone wrong here? programme. you re welcome. what you think has gone wrong here? difficult - think has gone wrong here? difficult to sa what think has gone wrong here? difficult to say what the think has gone wrong here? difficult to say what the actual think has gone wrong here? difficult to say what the actual problem - think has gone wrong here? difficult to say what the actual problem is. l to say what the actual problem is. it s very unlikely to be hardware, software changes are normally done in the middle of the night but there may well have been a software clash. the engineers are very good at