French Interior Minister Gerald Darmanin (right) and Britain's Home Secretary Suella Braverman sign a joint declaration signature at the Hotel Beauvau Interior Ministry in Paris, on Monday. AFP

Under the agreement, Britain will pay France 72.2 million euros ($74.5 million) in 2022-2023 so that Paris can increase by 40 per cent the numbers of security forces patrolling its northern beaches, the French interior ministry said.

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This means some 350 additional members of the French security forces will be patrolling following the deal, signed in Paris by French Interior Minister Gerald Darmanin and British counterpart Suella Braverman.

London and Paris also pledged to use technological and human resources on the French coast to better detect, monitor and intercept boats.

Migrants arrive at Dover harbour onboard a Border Force vessel in Dover, Britain. File/Reuters

They want to collect and use information, in particular from intercepted migrants, to better dismantle smuggling networks and deter crossings.

For the first time, teams of observers will be deployed on both sides of the Channel to "strengthen common understanding", improve the debriefings of migrants and increase exchanges of information.

The deal comes after the UK government said on Sunday that more than 40,000 migrants have crossed the Channel to Britain so far this year, a new record.

The provisional total for this year stands at 40,885, most of them Albanians, Iranians and Afghans — well in excess of last year's 28,561, the Ministry of Defence said.

Agence France-Presse