The Work and Pensions Secretary will stand firm on Labour’s £5 billion plans for welfare cuts on Wednesday, arguing that reform is needed to make sure the system survives. Liz Kendall is expected to say there is a “risk” the welfare state would collapse without the proposed changes, which include tightening the eligibility criteria for the main disability benefit in England, the personal independence payment (Pip). Restricting Pip would slash benefits for about 800,000 people, while the