I tried to travel to Ireland with a professional group in March 2017. At Heathrow Airport I was checked at Customs, where I showed my passport. I was taken to a holding room and held for several hours; fingerprinted, and sent home that afternoon. I am not a “high level” on the SOR. I received a letter stating my fingerprints would be on file for 10 years, and no entry to England, Ireland, Scotland, etc.
I lost all the money I paid for this trip.
Does this tell you anything?