On 4 September 1968 the track re-opened benefiting from an extension to the northeast of 600 ft including a long straight leading to hairpin and back to left-hander where the new section rejoined the original circuit.
An investment of £80 million was proposed to create a motoring centre of excellence, to include research and development facilities, showrooms and garages around the perimeter of the circuit.
In addition to a two-mile Grand Prix standard racing circuit and motor industry test facilities, the New Ingliston proposals would embody a luxury hotel, multi-screen cinema, bowling alley, garden centre, ''autopark'' trading units, and heritage museum, within its perimeters.
Jackie Stewart, who designed the track, said his involvement with the McGregor Holdings concept which includes personal investment, came afterpersistent requests from throughout the world to participate in developing race circuits.
Much of the original circuit remains in place with the only major missing piece being Arena, where a grandstand overlooking the main ring of the venue (used principally for the Royal Highland Show) has been constructed.