If the hon. Gentleman will be patient for a moment, I can tell him. It will be easy for the House to understand how the cumulative effect of that built up until we reached the annual inflation rate for this year, which continued to be underestimated by 0·1 per cent. I understand that the error was discovered and reported to my right hon. Friend the Secretary of State for Employment, who is responsible for this matter, late in the week prior to his coming to the House to make his statement.