Labour have opposed every reduction in welfare spending over the last 4 years. Every single one.
Indeed Miliband has made it clear that he wants welfare spending to go up, even though we are still clearing up the mess of Labour's debts, 5 million people on benefits in 2010, and the wider financial crisis. Ed has spent the last 4 years attacking every reduction in the welfare bill. There is never an alternative to how we balance the books - just criticism for us as Coalition in trying. On Monday he again proposes to criticise and hold a commons debate; at no place in that debate is he proposing an alternative; governments do not get every decision right - particularly when trying to balance the books as we have had to do but we cannot spend money we do not have any more, and that must mean welfare reform.
Ed wishes to undermine the radical reform that is Universal Credit; he has proposed one reform himself, by tinkering around the edges of welfare policy. It will not last. Dan Hodges in the Telegraph makes the point very clearly: http://blogs.telegraph.co.uk/news/danhodges/100276909/theres-no-point-trying-to-fix-ed-miliband-labour-needs-to-work-out-how-it-can-move-on-from-him/