The available information is in the following table.
West Lancashire parliamentary constituency November 1997 1,700 November 2006 1,210 Notes: 1. Latest available data are for November 2006. 2. For comparative purposes, earlier data have been provided for November rather than March 1997. 3. Data sources have changed over time; 1997 data are taken from five per cent. samples, and 2006 data are taken from 100 per cent. samples. 4. Five per cent. data have been rounded to the nearest hundred; 100 per cent. data have been rounded to the nearest 10. Source: Department for Work and Pensions, Information Directorate. Work and Pensions Longitudinal Study.