The Land Rover Defender should be practical enough for family use if its cabin layout suits your passengers. Useful size figures include 2025 OCTA P635 Edition One 5 Seats Petrol: 4813 mm; 2025 90 P400 S 6 Seats Petrol: 4323 mm; 2025 90 P400 S 5 Seats Petrol: 4323 mm; 2026 110 P525 V8 5 Seats Petrol: 5018 mm; 2026 110 X-Dynamic SE 7 Seats Petrol: 4758 mm; 61 more variants. Wheelbase and seating matter most day to day because they influence rear-seat comfort, child-seat friendliness and how relaxed the car feels on longer trips.