In the UK & Europe all tyres must be marked with a type approval code for road use and golf buggy tyres will not be stamped as their speed rating will be very low and not suitable for road use at all.
Anyway, a 205 tyre width is fine for a heavy car like a Jaguar XJ6, a BMW 7-series or a Mercedes E-class, but not for a 725 kg Mini.
For best dry road-holding a Mini is best on a good quality 165. For ultimate 'retro' Mini handling, wet or dry, a 145 is best, although the road-holding is generally not quite as good with the 145.