The BMW Z4 (2003-09) 2DR ROADSTER 2.5SI 218 SE AUTO is a two-seat convertible sports car, not a practical family hatchback. In the UK used market, it is a premium roadster with BMW badge appeal and more comfort than smaller, simpler convertibles. Its automatic gearbox suits relaxed cruising. Mycarcheck.com logged 41 look-ups covering 17 distinct cars, a useful snapshot but not a huge sample. The checks show an average private-sale value of £3,700 and recorded mileage of 80,000 miles. Cars averaged 3,000 miles yearly and 4.6 previous keepers, so check each car’s history and condition. The Z4 suits couples or solo drivers for weekend trips, not buyers needing rear seats or luggage. Its long bonnet, low stance and six-cylinder engine make for an engaging drive. Compared with a Mazda MX-5, it feels more premium; the Porsche Boxster is a rival, while BMW offers comfort and value. Condition matters in a convertible.