Check for common issues like engine oil leaks, worn suspension components (specifically the rubber cone suspension), and gearbox health.
In summary, buying a classic Mini Cooper is a rewarding endeavor for those looking for a charming, agile, and historic driving experience. It requires due diligence regarding rust, but the result is a rewarding, usable classic car.
If you are seriously considering this, I can help you narrow down the search if you tell me: