We've been told it endless times - with industrial growth lies th( promised land of full employment a healthy balance of payments prosperity for all. But some industrialists are holding back. Why? Because, they say, the rewards are negligible - and highly taxable; the ' disincentives ' make the risks not worth taking. As one company chairman puts it, ' No Minister is going to bail us out with L4 million if something goes wrong.' Tonight, Man Alive asks three successful firms why they are standing still. If their attitudes are typical, it is worrying news for all of us - and it will take more than exhortation to get Great Britain Ltd going.