The wife had a Petrol Mini Cooper for 9 years until 2016, doing around 5k a year, it was brilliant, only slight issues were a thermostat Housing Leak which occurred twice (a common problem) which got fixed on warranty and never happened again. I'm sure this isn't a problem on the more recent models. She's now got the mini coupè (2 seat) diesel (cheaper on road tax than petrol) which is more modern and is even better, no problems at all. One thing I've noticed that happened on both is the battery discharges if the car isn't moved for a week or two, not enough for it not to start but just too give a warning message, clears after it's had a run. We've always always purchased year old, low mileage direct from mini, still in warranty and you can often get them with a few years of the TLC package which gives unto 5 years free service. Worth searching on the mini website as the options on mini's are vast you'll be able to get exactly what you want.