HC Deb 01 April 1981 vol 2 c132W
56. Mr. Fitch

asked the Secretary of State for Transport what was the last year when the volume of motorway and trunk road construction in England was lower than that achieved in 1980–81.

Mr. Kenneth Clarke

Because of the approximations introduced by the revaluation process, it is not possible to make reliable comparisons in constant price terms over periods of more than a few years.