LONDON, England, July 29 (TNSres) -- The Charities Aid Foundation issued the following news release: * * * 59% of people have not heard of Payroll Giving, which allows employees to donate to charity via their salary before tax * * * Hard-pressed charities are missing out on much-needed income as fewer employees donate through Payroll Giving, research by the Charities Aid Foundation (CAF) has found. Since its launch in 1987, Payroll Giving has been through periods of rapid growth, particula more PR