@Natasha_Jay According to Wikipedia, yup!

"The angular hatchback was designed by Marcello Gandini[7] of Bertone, based on his unused design for the British 1977 Reliant FW11 concept and his 1979 Volvo Tundra concept car."

https://en.wikipedia.org/wiki/Citro%C3%ABn_BX

Also potentially relevant: https://www.youtube.com/watch?v=zXs9ZKHxxwo