The number of taxpayers with pension income in Luton can be found in Table 3.14 ‘Income and tax by borough and district or unitary authority’ or Table 3.15 ‘Income and tax by parliamentary constituency’ at the HM Revenue and Customs website http://www.hmrc.gov.uk/stats/income_distribution/menu-by-year.htm#314. The information is based on the Survey of Personal Incomes of which 2004-05 is the latest available.
Similar information is not available for 1996-97 as sample sizes were too small to base reliable estimates on.