Ser 1 front suspension

We all know Colin Chapman had a great love of raiding other peoples parts stores so I am assuming the Ser 1 Esprit is no different seen as most of its trim came from the British Leyland parts bins.
So is it reasonably safe to assume that the front uprights were also from British Leyland or are they as has been suggested from the Vauxhall parts Bin namely Chevette?