I was a manufacturing engineer on the Clio X65 project, introduction 1997/8? For the Lucas switches.
Given that we already made pretty much the same switches for the Megan, Laguna, traffic and roadsters, it mainly the air bag connector and colour and a new auto test of the self cancel function which measured the peak forces
IIRC we had to make 200 whilst Renault engineers watched and they ended up as part of thier pre-production run. I'm given to understand that because some of the suppliers were using prototype parts they planned on scrapping all 200 cars.
I have the first off the line in my shed (The switch not the car) because I had to take 30 to our development shop for some testing and I miss counted. It stayed in my boot for weeks and I eventually forgot it was there.
I visited the V6 Vauxhall assembly and test line some years later and we're driven from the main reception to that building in a white mk4 astra estate. Preprod cars used to get around site. Keys left in them.
Then I had an Interview at MINI and there were loads of gen 1s used by engineers to get around site.
I think MINI warranty problems would have been lowest the day before they brought out the Gen 2 ?