I remember once (several years ago) I spent a very uncomfortable 10 minutes with the Spanish Customs at Malaga Airport. I was carrying a Yaesu FT901DM transceiver and was on a direct flight from London to Gibraltar. Due to bad weather at Gibraltar, the flight was diverted to Malaga and all the passengers were dumped off at Malaga Airport for onward transportation by bus to Gibraltar. This was in the days before Spain was a CEPT signatory, so I would have needed a Spanish reciprocal licence to bring the transceiver into Spain. I did not have one. And there were Customs complications as well. The Customs Officer was not best pleased, but eventually let me go, muttering “No es correcto!!!”
Is this a foretaste of what we may have to expect when the UK leaves the EU?
P.S. As I was walking away, I noticed that the passenger behind me had opened his brief case to reveal about 200 BNC connectors in cellophane wrappers. I did not hang around to see what happened to him!