..........cars that became "knock-down".......
Or knocked-up as the Americans would say?

Correct me if I'm wrong, but part of the Plus 8 'charm' is that the Rover v-8 engine was used consecutively for 35 years by Morgan, and that was more by accident than design. Whatever one's viewpoint on 'diluting' the Morgan essence, you surely have to sympathise with a car company at the mercy of others for sourcing powertrains in this day and age.