Ros decides to act for the sake of her children's children and implements a ban on cars every Wednesday to try and reduce gas emissions. The country and Catherine are in uproar but Ros is unrepentant and refuses to back down. A by-election is looming and the Cabinet is worried that anger over the car ban will influence how they vote. Is the tide turning for The Amazing Mrs Pritchard? Miranda is furious with Liz for accepting a loan from Kitty. Catherine feels terrible but can't work out why. Eventually her secretary points out that her symptoms strongly imply she is pregnant. Emily gives up her job with Kitty and comes home to Downing Street. After a row with her mum she lets slip that Ian laundered money 15 years ago.