Embodiments of the present invention provide apparatus comprising: at least one motor vehicle switchpack (121-135), the switchpack comprising input means operable to control the switchpack to provide a switchpack control output to a motor vehicle control system; and motor vehicle test apparatus (100T), the test apparatus comprising: a test apparatus control system comprising computing means (115); test apparatus switching means operable under the control of the test apparatus control system to control the at least one switchpack to provide the switchpack control output to the vehicle control system, the test apparatus control system being operable to monitor a response by the vehicle control system to the switchpack control output.