Their time, their money

John Sutherland's article "Double your money" (THES, June 16) has one big drawback, namely that what he writes about is still moonlighting. Having recently done some teaching outwith the university as well as reviewing, I felt morally obliged to pay the cheques into the departmental account. Sutherland is right to say we have more disposable time than other professionals, but it is paid for by my employer.

Edwin van Teijlingen. University of Aberdeen.