The HPN is recorded as a French Racer 500, but in reality was a lightly modified Effyh. The car had already appeared in 1951 as the Barraquet (bean) and was bought by Roger Hillier around the end of the season. Hillier would replace the nose cone with something slightly tidier than that used on the Barraquet, but many of the original Effyh panels survived intact. Hillier used a Norton engine
Some known results for Roger:
He continued to use the car until at least 1954.
If anyone has any more details or photos of this car, please get in touch.