The CBI Industrial Trends Orders balance tracks demand sentiment among UK manufacturers. The CBI (Confederation of British Industry, a private business lobby) runs the Industrial Trends Survey each month. Roughly 220 to 350 firms across 17 manufacturing sub-sectors take part in a typical round.
Each firm says whether its present total order book sits above normal, normal, or below normal in volume terms, excluding seasonal swings. Firms with no order book estimate demand instead. Normal means the firm's own usual level, so the result is sentiment, not official output statistics. It is a private CBI survey, not data from the Office for National Statistics.