Glass maker Pilkington lost 1p to a 21-year low of 43.25p on fears it might cut its dividend, and Invensys dropped 1.25p to its worst-ever level of 10.75p.Manufacturers are facing stagnant world trade and stiff competition from the Far East, notably China, where the costs of doing business are a fraction of those in the UK. Chinese labourers earn about ??100 a month and increasingly have the skill