Cameron raises fears of more delays for IDS benefit reforms The system has suffered from management failures and delays for several years, and was strongly criticised by the National Audit Office last week. Answering MPs" questions about Universal Credit, Mr Cameron refused to repeat that assurance. He said: "The department says it can still do it on the 2017 timetable . . . The important thing is to get it right. We shouldn't be religious about timing, we should be religious - as it were - about the overall concept. Mr Duncan Smith last week told MPs that officials had failed to tell him about problems with the programme. When asked about Mr Duncan Smith and his civil servants, Mr Cameron said: "Everyone has to take responsibility." Liam Byrne, the shadow work and pensions secretary, said Mr Duncan Smith's promises had "just been shot to pieces by his boss."