UK Borders Bill

What happens if someone does not notice that changes to the notification requirements have been advertised, say, on television? What would be the penalty if someone missed the announcement, as people do? Everybody knows that whenever the Government make an announcement, thousands of people, completely inadvertently, will not read it in the Times or see it on the BBC News and do not look at the web. A great many people never look at the news. What happens when the person who is required to notify the Secretary of State under some change specified in the Bill fails to do so? What are the penalties? Will it be a defence in any proceedings against them for failure to do so that they were unaware of the change that had been made?