My problem with this didn't start last week, IDS says, he says he has always believed in social justice and had previously seriously considered resigning. "I felt semi-detatched, isolated in a sense" he says. He claims he was trying to explain the need for fair changes but that often his motives were not understood or explained within the Government. He began to lose the ability to make the case for his way of doing things, he was losing his influence. "I progressively got more and more depressed that we were running to an arbitrary agenda with a welfare cap in it", he adds. He says a letter he sent out to colleages was designed to say "it's not what it sounds like in the Budget". He says he felt in the end he couldn't get his message across about what the PIP changes mean and that forced his hand in terms of his resignation. "It will be a requirement that will bear down on working age benefits" he says of the fact that the PIP cuts are still in the Budget book. He says it will undermine the party's ability to make changes in a fair way so everyone shares the burden. IDS also warns that it is not a good way to make policy to change your mind so quickly as he tackles why he didn't decide to stay on desipte the Government's u-turn.