Labour ’s own voters now see high immigration as the biggest single pressure on the National Health Service, a survey has found.

The poll of 2,000 people who last year voted Sir Keir Starmer into Downing Street came as another 437 migrants in small boats crossed the Channel to Britain on Friday, followed by 583 on Saturday.

It illustrates the threat to the party posed by Reform UK’s immigration policies, which includes freezing all non-essential immigration and stopping the illegal small-boat Channel crossings.

The survey asked the Labour voters which out of five issues creates ‘the biggest burden’ for the NHS, and some 24 per cent said high immigration.

And when asked about their voting intentions, 22 per cent said they would consider voting Reform at the next General Election, while 40 per cent declared approval for the party’s leader, Nigel Farage.