Thanks for the comments. Yes it is the car in the Castle Combe Saloons. I have been using a 'Gurney Flap' on the roof spoiler but it is not permitted for next year but I can fit any genuine SEAT part. I have a 'Cup' wing and bracket which can be mounted on the outside as suggested but I am waiting for confirmation that it is available from any SEAT dealer. I thought maybe there was a BTCC type body kit available?
I thought you might be interested in the cars spec;
Engine/Transmission - Billet Steel Crankshaft, JE pistons, ARP Bolts, Head Bolt Conversion, Scat Rods, Supertech valves/springs, CNC flowed head with Cat Cams and solid lifters, line bored and balanced, Neuspeed pullies, Garrett ball bearing type Turbo with external waste gate by Owen Developments, Hypertune inlet manifold with Spec R intercooler, adjustable cam pulleys, Bailey dump valve, engine oil cooler plus power steering fluid cooler, Acusump, free flow large bore exhaust system (93Db), Big injectors, comp fuel pump & swirl pot, Samco hoses etc, 6 speed box
Cupra Cup gear box with LSD, quick shift, rose jointed gear linkage,
Suspension & Brakes - Custom made Ohlins coil overs - 2.25" dia springs, Fully adjustable top mounts, AP 6-pots with bell mounted discs, Pagid RS15's, Tilton bulkhead mounted top hinged pedal box, Racetech quick release OMP steering wheel
Bodyshell - Right Hand Drive, Full multi point weld-in cage, Recaro Proracer HANS SP-G XL seat, Willans 3" Silverstone 6x6 harness with alloy adjusters, electric fire ex system, mountings for passenger seat, carbon fibre door cards, waterproof breathable custom cover, Widened steel front wings, Heated Front Windscreen
Electrics - Full custom harness by GWR Motorsport with detachable engine harness for dyno installations, Motec M400, AIM MXL Pista Display with full data logging, GPS and Memory Stick, Owen Developments switchable rain map. Fuel sampling facility, road legal lighting
Wheels & Tyres - 6 No. 8.5 x 18 BBS CH Motorsport Alloys