AFAIK in EU-OPS you must have a RA for CATII . inner markers are practical nonexistend here. more, the glideslope must be 3 deg.
so when the terrain may give irratic RA readings in the vicinity of DH or a steep approach is needed the airport will simply not have cat II or more.
the aircraft must be quipped with an radar altimeter and two indepentend autopilots which must be approved and functional.
on the bae146 we did catII approaches and there is a light "CATII green" which signals that both autopilots are tuned properly and crosschecking each other. otherwise you are CATI limited for the app.