This is just insane. Since the Windrush. The NHS has had a high dependency on immigration. Mainly due to our own lower pay of staff. Many qualified British medical staff can get higher paying work elsewhere. Both foreign and non NHS UK jobs. This is why multiple governments from both parties haver always offered NHS training and employment as a way to encourage immigration from lower paying nations.
If the gov does not have the funding (wish to raise taxes). To pay NHS staff and UK care staff a wage that competes with higher paying jobs in the UK or aboard. This will directly lead to a collapse of the NHS. With ) benifit to the UK.
Except Maybe gaining privatisation of the NHS. Exactly like the Tories have been trying for decades.