Woken by an early morning phone call, Hannah sets off for Downing Street, where the Foreign Secretary's husband has been caught in an online hack of an illicit dating website called Indiana Ray. Elsewhere, travelling home from an evening out, Rose confesses to James she doesn't want children - ever. Later, at Ruth's house, a family dinner proves disastrous when Nina gets drunk and drops a bombshell about Nathan which threatens to tear Hannah's life apart. Abi Morgan's drama, starring Nicola Walker, Stephen Mangan and Deborah Findlay.
Mathew stars as Rex Pope.
Watch on Tuesday 15th May on BBC One at 9pm.