The Home Office said 802 people were brought ashore at Dover over the course of three days.
The boat, carrying 82 people, ran aground on a beach in northern France, says local official.
On Saturday, 602 people arrived on nine boats, marking the second busiest day so far this year.
A three-year deal to pay for more French patrols to intercept smuggling gangs was due to expire at midnight.
Ali Omar Karim pleaded guilty to conspiracy to assist unlawful immigration.
The operation follows a change of tactics agreed amid growing pressure from the UK government to step up interventions.
He denies endangering 46 people during a boat crossing to the UK on 5 January.
The 803 arrivals - a record for a December day - brings the total number this year to 41,455.
