Anne Thomson brought her replica GP Darracq from New Zealand this year and ran it at the Goodwood Festival, Loton Park and Shelsley Walsh and won the Edwardian class at VSCC Prescott hillclimb, before going to France for the 1906 GP centenary celebrations. Excellent to see a giant-engined car so effectively used. However, it has been described as a modified 1906 GP machine, but I prefer to greet it as a replica of a 1907 French GP Darracq because its engine bore is 180mm like the 15,268cc 19137 cars, whereas the 1906 Darracqs had 170x140mm (12,711cc) power units.
I have not seen the piston stroke dimension for the NZ replica, but at Prescott the engine size was given as 14,250cc. I suppose we should regard this as a 1906/07 car, as those who put 41/2-litre engines into 3-litre Bentley chassis quote them as, for example, 1927/29.