Aircraft Factories (Black-Out)

Mr. Wakefield
asked the Minister of Aircraft Production whether he is aware that his officers are still giving instructions to black-out daylight in factories by the use of bitumen and like substances, thereby causing unnecessary consumption of artificial light; and what action does he propose to take to stop this practice and encourage the maximum use of natural, instead of artificial, light, thereby saving fuel?

Colonel Llewellin
I am taking steps to see that maximum use is made of natural light wherever that is possible, having regard to the necessity of complete blackout during the hours of darkness.