HC Deb 05 June 1957 vol 571 c1229
14. Mr. Nabarro

asked the Minister of Transport and Civil Aviation how many heavy goods vehicles were affected on 1st May, 1957, by the increase in maximum speed from 20 m.p.h. to 30 m.p.h.; and what steps he is taking to secure the removal from such vehicles of the plate carrying the figures "20".

Mr. Nugent

About 140,000. I hope that owners will see to it that a disc which has ceased to have meaning is removed.