The former Brexit negotiator says EU countries would reject any British attempts to follow economic rules "a la carte".
The PM was responding after a police chief said comments made during Russell Brand's trial came close to "victim blaming".
A 17-year-old boy from Gloucester has also been arrested on suspicion of assisting an offender.
The show was cancelled after a BBC Panorama investigation heard allegations from three former cast members.
The children of Patricia Lashley grew up believing their mother had abandoned them.
The driver stayed at the scene and there is no indication that this was a deliberate act, police say.