The number of employees working unpaid overtime rose by 103,000 in 2007, bringing the total to nearly 5 million, according to new analysis published by the Trade Unions Congress (TUC) last week.

Nationally, employees who work unpaid overtime would receive an extra £4,955 a year if they were paid for the extra hours. The average amount of unpaid overtime is around seven hours a week.

Next month, the TUC will release figures for unpaid overtime by occupation. According to figures it released last year, 39% of surveyors, town planners and architects work unpaid overtime around twice the national average. If they were paid for these hours, they would earn an average of £6,400 extra a year.

Friday 22 February 2008 is ‘Work Your Proper Hours Day’.