I think this is aimed at people from a certain country with whom the UK is currently having a few diplomatic difficulties, not folk coming back from a day trip to the Channel Islands. However, we might I suppose get caught up in the 'unintended consequences'.
We have a few to-ings and fro-ings without any official presence but on the other hand if we saw anyone we didn't know or some suspicious activity, we'd be dobbing them in PDQ.
TOO