The theory and the practice
While all this may be very well in a lawyers exam, in the day-to-day workplace it's irrelevant. No matter what the law states, you will still get individuals or groups of friends writing countries' names on small pieces of paper and charging "willing participants" a quid a pop to engage in a bit of a laugh.
Who cares if it breaks the letter of the law? These days there are so many laws that we probably unwittingly break have a dozen every day.
What does matter is that the law enfarcement people have better things to do than try to crush small-time and often spontaneous activities like this. We know that these little sweepstakes happen every year with the Grand National and a few other events. Telling people they're illegal doesn't do anything to endear the participants to the legal system.