Nearly 400 migrants crossed the English Channel in small boats on what was the hottest day of the year.
The Home Office has confirmed that 394 people made the perilous crossing in six vessels on Friday.
It was the first arrivals of this type in nearly two weeks.
Pictures show people in lifejackets being led from a Border Security Command vessel in Dover, Kent.
A break in the recent poor weather allowed for several crossing attempts to be launched on Friday, when temperatures reached 28.4C in Heathrow, Cambridge and Cranwell in Lincolnshire.
That made it the hottest of day of the year, although that was surpassed on Saturday when the temperature hit 30.3C in Frittenden, Kent.
The crossing was the first since May 9, and so far this month, more than 1,000 people have arrived.
The number of arrivals had been down 44% on this time last year, and 23% on the same point in 2024.
Experts have said it could be down to a number of different factors including the weather, the supply of small boat parts, government policy and the number of migrants coming into Europe.
It comes after it was revealed that UK net migration dropped to an estimated 171,000 last year, the lowest level since the start of the coronavirus pandemic.
The figures for the 12 months to December are down 48% compared with the previous year (331,000), according to the Office for National Statistics (ONS).
It is the first time the estimate – which is the difference between the number of people arriving and leaving the country – has fallen below 200,000 since the start of the Covid-19 outbreak.
The figures could lead to renewed calls for Home Secretary Shabana Mahmood’s immigration policies to be watered down.
Marley Morris, from think tank the Institute for Public Policy Research, said the Government’s progress “should prompt a more measured debate”.
