HC Deb 25 July 1974 vol 877 c524W
Mr. Woof

asked the Chancellor of the Exchequer what estimate has been prepared of the total extent of annual losses to the Exchequer caused by deliberate tax avasion; and what is the present estimated annual loss.

Dr. Gilbert

I regret that the nature of these illegal practices is such that it is impossible to make estimates of the sort requested by my hon. Friend.