‘It's by invitation only,’ a guard at the entrance to the House of Commons told me on Wednesday morning. I was trying to join the people from Fuel Poverty Action (FPA) who had just gone in, uninvited, for a 'warm-up'. The activists had chosen the day of the chancellor’s autumn statement to ask MPs about measures being taken to ensure people can afford to heat their homes. When I got to the lobby, I saw the group surrounded by police. Five minutes later, they were on their way out, chanting: 'No more deaths from fuel poverty.' 'Cold homes kill,' one of their banners said. Winter excess deaths in England and Wales in 2014-15 – the number of people who died between December and March minus the average over the rest of the year – have been estimated by the Office for National Statistics at 43,900, the highest for 15 years. According to the World Health Organisation, at least one third of those deaths are likely to have been caused by fuel poverty.