§ As I have said, I am concerned that businesses should continue to invest for the future. Our tax system already provides generous incentives for investment in new machinery. But modern machines will seldom yield their full potential if they are housed in obsolete and inefficient factories. I therefore propose to increase the initial allowance for expenditure incurred after today on the construction of new industrial buildings, from 50 per cent. to 75 per cent. The cost will rise to £25 million by 1984–85. This will benefit not only manufacturing but also employment in the construction industry.