HC Deb 04 February 1993 vol 218 c297W
20. Sir Michael Neubert

To ask the Chancellor of the Exchequer what is his estimate of the amount of revenue lost through tax evasion in the cash economy.

Mr. Nelson

That part of the economy known as the "underground" or "hidden economy" is, by its very nature, unseen and thus unmeasurable. Reliable estimates of its size are therefore not available.