This is not surprising. After Blair/Blunket failed to get the ID card introduced in the late noughties, the voter registration procedure started to require one's National Insurance number (never intended for this purpose), all very handy for a <i>de facto</i> national database. I know quite a few people who stopped registering to vote then. Now the Tories have introduced an ID requirement (passport or similar) in the polling stations in addition to the voting card sent to your address. Obviously intended to dissuade the poor and marginal, but rather backfired in also disproportionately discouraging the old, their natural electoral base.