Detectives want to trace the movements of a white Vauxhall Astra van used by the gunman and his accomplice.
He decided to phone the police and they noted the registration number of the Vauxhall Astra McManus was driving.
The cars involved were a silver Vauxhall Astra estate and a black SAAB.
The plant employs more than 2, 000 people and produces the Vauxhall Astra model.
The family's Vauxhall Astra was in collision with a Seat Leon on Boothtown Road in Halifax on Sunday afternoon.
They drove off in the white Vauxhall Astra and abandoned the pair, aged 18-months and five, half a mile away.
Officers said CCTV footage from the park showed Mr Powell's car driving into the park, shortly followed by Parkes' Vauxhall Astra.
The silver Vauxhall Astra, which had a broken wing mirror, was hired for Ms Spence about two weeks before she vanished.
Police believed her Volkswagen Polo and Mr and Mrs Knight's Vauxhall Astra collided at the Wendling turn-off, near Dereham, while heading in opposite directions.
Police are still trying to trace the gunman, his accomplice and the origin of a white Vauxhall Astra van used by them to flee the scene.
Sam was a front-seat passenger in a black Vauxhall Astra which left the A449 and hit a tree, near the Island Pool pub, at about 01:00 GMT.
On 29 April Coats and Wade drove to Tighnabruaich, Argyll, in Lynda's hired Vauxhall Astra where they asked Wade's friend Lee Winyard if they could use his boat.
Karen Reilly, 18, from west Belfast, was shot dead when Lance Corporal Clegg and other members of an army foot patrol opened fire on a stolen Vauxhall Astra car on 30 September 1990.
Under cross-examination by Gary Allan QC, defending Mr Wade, it was suggested to Mr Winyard that he was mistaken and that the car he saw was not a Vauxhall Astra, but a Daewoo.
The two 19-year-olds were travelling in Vauxhall Astra car which is believed to have been stolen during a creeper-style burglary in the Deerpark Road area of Belfast during the early hours of Saturday morning.
The vehicles were described as one which was a light coloured car, a dark coloured car, which he said may be a Vauxhall Astra, and a red vehicle, believed to be a Ford Orion.
Police said the men then got back in their cars - a silver Peugeot 306, a black Volkswagen Passat and a dark coloured Vauxhall Astra - and drove off along Briscoe Lane towards Ten Acres Lane.
The men then got back in their cars - a silver Peugeot 306, a black Volkswagen Passat and a dark coloured Vauxhall Astra - and drove off along Briscoe Lane towards Ten Acres Lane, officers said.
Mr Iliffe, of Chatteries, and Mr Kiely, of Silvertown, east London, were walking in the carriageway along Wimblington Road, towards the A141, at 03:45 GMT when they were hit by a Vauxhall Astra being driven by Bishop.
Vauxhall's Ellesmere Port car factory will build at least 160, 000 Astra vehicles a year in a deal that secures the future of the plant and protects thousands of jobs.
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