If you passed your test pre 97 you can drive a mini bus, tow a trailer/caravan. without a further test, BUT if you are driving the bus for hire or reward then you need a PSV, question is are you driving the bus for work and being paid, then you come into hire or reward, its an arse, I drive for national/alamo 2 days a week, we all had to get taco cards 2 years ago because we drive mini buses, then the good old DVLA decided that this was not needed, If you drive a mini bus in Europe (not our bit) you need a taco card.
You can drive up to 15 seats.
And yes, if you send your licence in to get points put on, change of address put a covering letter in saying that all the "CATS" to be left on, otherwise they may remove them.
I still dont understand why teachers dont have to do a full PSV to drive the school mini bus with kids in.