A motor vehicle having: prime mover means; at least first and second groups of one or more wheels (12, 13, 14, 15); and a driveline (18, 19, 22, 23, 24, 25, 26, 27) to connect the prime mover means to the first and second groups of one or more wheels such that the first group of one or more wheels may be driven by the prime mover means when the driveline is in a first mode of operation and the second group of one or more wheels may additionally be driven by the prime mover means when the driveline is in a second mode of operation, the driveline including an auxiliary portion comprising releasable torque transmitting means operable to connect the second group of one or more wheels to a torque transmission path from the prime mover means when the driveline transitions between the first mode and the second mode, the vehicle comprising control means operable automatically to control the driveline to transition from the first mode to the second mode and from the second mode to the first mode, wherein the control means is operable to prevent a transition from the first mode to the second mode and/or from the second mode to the first mode in dependence on a value of a prescribed vehicle operating temperature; characterized in that the control means is arranged to prevent a transition from the second mode to the first mode when the value of the prescribed vehicle operating temperature is below a first prescribed value; and wherein the prescribed vehicle operating temperature is selected from the following: the temperature of a component or fluid of the vehicle, a component or fluid of the auxiliary portion of the driveline or a component or fluid of the releasable torque transmitting means. prime mover means; at least first and second groups of one or more wheels (12, 13, 14, 15); and a driveline (18, 19, 22, 23, 24, 25, 26, 27) to connect the prime mover means to the first and second groups of one or more wheels such that the first group of one or more wheels may be driven by the prime mover means when the driveline is in a first mode of operation and the second group of one or more wheels may additionally be driven by the prime mover means when the driveline is in a second mode of operation, the driveline including an auxiliary portion comprising releasable torque transmitting means operable to connect the second group of one or more wheels to a torque transmission path from the prime mover means when the driveline transitions between the first mode and the second mode, the vehicle comprising control means operable automatically to control the driveline to transition from the first mode to the second mode and from the second mode to the first mode, wherein the control means is operable to prevent a transition from the first mode to the second mode and/or from the second mode to the first mode in dependence on a value of a prescribed vehicle operating temperature; characterized in that the control means is arranged to prevent a transition from the second mode to the first mode when the value of the prescribed vehicle operating temperature is below a first prescribed value; and wherein the prescribed vehicle operating temperature is selected from the following: the temperature of a component or fluid of the vehicle, a component or fluid of the auxiliary portion of the driveline or a component or fluid of the releasable torque transmitting means.