Would you part with your 2013/4 A3 2.0l Tdi 184 Quattro S Line S tronic with 55k miles, Satnav, rear parking sensors, hill hold assist and a brand new set of Michelin Ps4's on original refurbished Audi rims PLUS £15k for a 2017/8 (310bhp) S3 Black edition with 15k miles with sunroof, B&O sound...