Do you have data that supports that ?
I just had a look online, and it appears the issue is the number of training positions.
How bad is the doctor employment crisis and what is being done? - News - Doctors.net.uk
A snip from that -
"In specialties such as core psychiatry, there were a staggering 10,667 applications for just 489 training posts. In anaesthetics, just 539 places were available for 6,770 applications. In general practice, 20,995 applications were made for just 4,276 training posts."
Meanwhile, doctors leaving the UK are not just UK trained.
Worrying exodus of internationally qualified doctors, GMC warns | The BMJ
From that link-
"Hardening of anti-immigrant rhetoric in society could drive more foreign doctors away from a “less welcoming” UK, the General Medical Council warns.
Its warning comes as new data show an increasing number of internationally trained medical graduates leaving the UK health workforce. A continuation of this trend would create “huge holes” in the NHS workforce that the service would struggle to fill, the GMC said."
It seems a lack of training positions means trained docs from abroad ? And I think, given how long it takes to train, and to train the trainers etc, it's one of these things that take years to fix, and takes years to create. As in, effects from decisions made ten years ago are seen now, and decisions today will maybe take 10 years to see a difference.