What's the difference between full-time and part-time 4WD in UK cars?

The key difference is that full-time 4WD (like in Land Rover Defender) constantly powers all wheels, while part-time 4WD (as seen in Nissan Qashqai) only engages when extra traction is needed. In the UK, full-time systems offer better performance in challenging conditions but use more fuel, whereas part-time systems are more fuel-efficient for everyday driving on British roads. Full-time 4WD is common in premium SUVs like Range Rover and BMW X5, providing superior handling on wet UK motorways and rural lanes. Part-time systems dominate mainstream crossovers, automatically switching between 2WD and 4WD - ideal for typical UK weather conditions. The choice depends on your driving needs: serious off-road capability versus urban efficiency.