They will not have PPL training going on but will cater for everybody else.
Why not? Old Sarum and Compton Abbas are good examples of a single grass runway unsuitable for CAT but licensed and doing PPL training. The situation WRT training and licensed a/d is under review. It's a bit of a blunt instrument. It would be a better idea, now that training has to be done at a FTO or Registered Facility for the FTO/RF to demonstrate suitability having regard to the aircraft types to be used. An a/d that's perfectly adequate for training in something slow might be totally unsuitable for something a bit quicker. A bumpy grass surface is fine for some types but not for others. A change to the regime could take this into account.