Badge engineering is by definition a weakness. And marketers were and are crazy about it. While 'the market' has never appreciated the concept.
And it is not the least brands that have committed themselves to it. In 1949 Rolls-Royce made the Silver Dawn and the almost identical Bentley MKIv. BMW and the Rootes Group joined in 1957 with the Riley1,5 / Wolseley 1500 and in 1958 with the Hillman Minx and the Singer Gazelle.
At the time of the Hillman Hunter, the trend was broad. Even Jaguar made doubles (Daimler Sovereign / Jaguar 420).
Almost identical Singer and Sunbeams were side by side on the export lists with considerable price differences while the customer was not really eager to count a solid bowl of money extra for just a vinyl day cover and a few extra headlights.
For example, Rootes made a successful attempt to capture two rather prestigious and sporting brands under a large damp gray blanket.
So the Humber Scepter, a pimped Hillman Hunter, it was not. Despite its overdrive, its cool rim rings and dual headlights.
In Iran the cars did the best for lack of anything else. They were built there under license. So if you come across a Peykan sooner, you know where you can still get the parts: from your British classic specialist.