Quote
Paying a plumber cash in hand is "morally wrong" because it denies the
revenue vital funds, a Treasury minister said as the government outlined
new ways of cutting down on £5bn in tax avoidance.

David Gauke, the exchequer secretary to the Treasury, risked shining a
spotlight on whether any of his government colleagues have ever made
cash in hand payments to plumbers when he described the practice as a
large part of Britain's "hidden economy".
Unquote

http://www.guardian.co.uk/politics/2...dspending-hmrc

Trades poeple operate to current moral norms, as displayed by bankers,
politicians, journalists, entertainers, pro footballers etc. Is that news?