Average incomes from pensions are highest in the Conservative heartlands of the South of Britain, so this is where the pain would be felt if winter fuel allowances, free bus passes and free TV licences for pensioners were means-tested.

In this interactive map, parliamentary constituencies are grouped according to the taxpayers’ mean income from pensions. The constituencies are pooled into five equally-sized groups with those with the richest pensioners shaded darkest, and the poorest pensioners lightest. These can be compared with the party of the current MP for each area.