The BMW Z4 (2003-09) 2DR ROADSTER 2.5SI 218 SE is a premium two-seat convertible, aimed at drivers seeking open-air enjoyment rather than family practicality. In the UK used-car market, it sits among affordable older sports roadsters, offering a more upmarket feel than a Mazda MX-5 and competing with cars such as the Mercedes-Benz SLK. mycarcheck.com has recorded 97 checks covering 46 distinct cars, a useful snapshot rather than a huge sample. Those records show an average private-sale valuation of £3,400 and average recorded mileage of 85,000 miles. Typical annual mileage is relatively low at 4,000 miles, while cars have averaged just over four previous keepers. The 2.5-litre Z4 suits couples, enthusiasts and commuters wanting a weekend car, though its small cabin and luggage space make it less suited to families. Its refined six-cylinder character, sharp handling and retractable roof are key attractions; check service history and roof operation when viewing an example.