Faily sure this is / was at Tom Grace Farm at Woodhill.

The cars

The Eggelton Brothers Vitesse 6 powered Triumph - in a Herald body/chassis single headlights could just be a Herald bonnet .

Name: NSCC 1978 #131 Autocross Jan 1978 Q Triumph Vitesse 6 powered 36 T is Tony Eggleton 37 is Mike E.jpg Views: 523 Size: 107.2 KB

thought to be David Thexton Datsun 1200 - great car in its time.
Name: NSCC 1978 #132 Autocross Jan 1978 Q Datsun 1200 David Thexton Q Dennis Green (800x487) (2).jpg Views: 445 Size: 119.7 KB

Name: NSCC 1978 #133 Autocross Jan 1978 Q Escort Mark 1 Dennis Green (800x537) (2).jpg Views: 478 Size: 114.4 KB

Name: NSCC 1978 #134 Autocross Jan 1978 Q Escort Mexico Mark 1 Dennis Green (800x546) (2).jpg Views: 414 Size: 110.9 KB

Name: NSCC 1978 #135 Autocross Jan 1978 Q Mazda RX2 Dennis Green (800x522) (2).jpg Views: 436 Size: 125.7 KB

Name: NSCC 1978 #136 Autocross Jan 1978 Q Escort Van - house in background Dennis Green (800x523) (2).jpg Views: 461 Size: 137.1 KB

More to come - some of the same cars.