McColl s named one of the worst places to work in UK thenational.scot - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from thenational.scot Daily Mail and Mail on Sunday newspapers.
NATS, formerly the National Air Traffic Service, defence contractor BAE Systems and consumer goods company Unilever have been ranked as the top three employers for shift workers in the UK.