I too am certain that Brands Hatch used Mk3 Cortinas for celebrity races at about the same time that they were also using the ultimate getaway car, yes the Granada
as seen on the Sweeney. They might have had to use the Cortinas because the Granadas were getting written off very rapidly by such luminaries as Bernard Gallacher etc. Who can forget Anthony Marsh coming up with the most obvious line when he rolled that car, "Yes he has rolled it into a ball at Paddock"