A lock mechanism for a vehicle door latch comprising a lock actuator drivingly coupled to a lock link for movement of the lock link between a first position corresponding to a locked state of a latchand a second position corresponding to an unlocked state of the latch, the mechanism further comprising a superlock actuator drivingly connected to a superlock link slidably mounted for movement of the superlock link between a third position corresponding to superlocked state of the latch and a fourth position corresponding to a non-superlocked state of the latch, a fixed abutment formation and aninside lock lever mounted such that in the fourth link position, movement of the lock link between the first and second positions may be achieved and in the third position the relative positions of the inside lock lever and superlock link and abutment formation are such that movement of the lock link between the first and second positions is prevented.