Why are French police not stopping small boats crossing the channel?

ITV News - What You Need To Know

As another day dawns on the English Channel, another dingy makes its way across the waters.
Full to the brim with migrants, determined to make a new life for themselves.
And yet, despite the British government’s recent social media campaign to deter illegal immigration, boats still come, packed and in plenty.
So, why is the campaign not working? And can anything stop the dangerous journeys?
ITV News Correspondent Peter Smith tells Lucrezia Millarini what you need to know...