A record 230 migrants arrived after crossing the Channel to the UK in a single boat on Monday, according to reports.
GB News said the "mega dinghy" left France overnight, arriving in Dover in the early hours.
The number breaks the previous record from July when 165 people successfully made the crossing.
People smugglers have been increasing the number of migrants crammed into boats in recent months.
A dinghy carrying 173 people capsized in the English Channel after its engine caught fire earlier this month.
The UK Home Office has been approached for comment.