Abstract: Unitary integrated door latch assembly for vehicles, best seen in FIG. 1, has retention mechanism including a rotary or other latch bolt which engages a door post striker locking mechanism for locking and unlocking the retention mechanism, and electrical actuation and switching means for remote operation of the assembly and/or operation of latch assemblies of other doors of the vehicle e.g. as part of a central locking system, the assembly being in the form of a unit having a body or housing containing at least the electrical components and preferably also the mechanical components substantially sealed for protection and to resist tampering, and with electrical circuitry moulded into the body for plug-in connection of actuators, switches and other electrical components and for plug-in connection to external circuitry, the housing accommodating various selections of electrical components so that a common standard unit can be readily adaptable to different modes or systems of operation e.g.