Classic sports cars have wires.
That's all.
Isn’t the original Plus 8 a classic sports car then Dave? It was only available with alloys originally.
At the time, it was thought that wires couldn't take the torque from the V8.
There may have also been a desire by MMC to make the Plus 8 distinctive. So its a mark of that era.
Those early Plus 8 alloys are certainly rough cast, and although I like that look, wires look way better.