Fuel Poverty Stats 1996-2009
This document from DECC gives the number of people in fuel poverty in the UK from 1996.
In particular, there is a good graph on page 9 showing what’s happened with fuel poverty numbers since 1996, which is reproduced below.
There’s also a table on page 10 that lists fuel poverty numbers for the UK in each of those years:
Here are the updated figures for 2012: Annual Fuel Poverty Statistics 2012