Nevertheless, the Sizaire brothers' participation in the automotive business was far from over and, in 1913, with the help of Frederick William Berwick, the London-based UK importer of Corre La Licorne cars, they obtained finance in London for the launch of a new automobile manufacturing company called Sizaire-Berwick.

The pre-cars were produced at the brothers' homebase in Courbevoie, on the northern edge of Paris, but 80% of the production was shipped to England, where they received their bodies, mostly fitted by Berwick's own coachbuilder located at Highgate, on the north side of London.

[2] Jack Warner, the actor who later portrayed British icon Dixon of Dock Green worked at the repair facilities in Balham,[6] where he had started by sweeping the floors for 2d per hour.

In 1915, Berwick built a new factory at Park Royal, a London suburb used initially for the production of aeroplanes.

[2] At the Paris Motor Show in October 1919 Sizaire-Berwick took a stand and exhibited a "torpedo" bodied car powered by a 4-cylinder engine of 4523 cm3.

Five years later, at the Paris Motor Show in October 1924 Sizaire-Berwick were still taking a stand and exhibiting a car with the same 4523 cm3 engine as before, but with the wheelbase now extended to 3,680 mm (144.9 in).

[10] Two years after that, Sizaire-Berwick appeared at the Paris Motor Show for the last time, displaying a large luxury car, now with a 6-cylinder engine from Lycoming of Pennsylvania.