It's got a few advisories from the MOT, but otherwise from it's MOT history looks quite clean. Probably around £500 to put right.
Offside Front Anti-roll bar linkage has slight play in a ball joint (2.4.G.2)
Nearside Rear Anti-roll bar linkage has slight play in a ball joint (2.4.G.2)
Offside Rear Anti-roll bar linkage has slight play in a ball joint (2.4.G.2)
Offside Rear Tie bar/rod has slight play in a pin/bush (2.4.G.2)
Brake pipe slightly corroded Front to rear pipes (3.6.B.2c)
£21k looks about right, but I'd haggle and Verdi Mexico is quite rare on a 4200 especially a Spyder.