Curious, the S4 at SGT is just 3 weeks younger than the S3, and £23k more expensive. Looks a lovely car though.
Brian
Hardly comparable though - one has done 30k miles and the other 3k miles! The S4 is nearly new, the S3 has been used (personally mileage is never a concern for me on an Aero as I know they are good for it, but a lot of owners prioritise low mileage).
Even at equal mileage I'd expect the relative rarity of the S4, and the multitude of updates the S4 model benefitted from to keep the S4 priced significantly above the S3.