Mr Cummings today said the assumption that people would tire of obeying the rules was 'obviously completely wrong'. Members of SPI-B today hit back at Cummings's claim and said he 'does not appear to understand the role of SPI-B not the contribution of behavioural scientists'. In a rollercoaster appearance in front of MPs today Mr Cummings outlined a series of failings by Mr Hancock and the Department of Health and Social Care. Pushed on why he didn't, Mr Cummings said: 'That would be speculation on my part. 'We absolutely reject Mr Cummings' claims about the Health Secretary.'