I'm not going to answer all your questions because you will have your answers to them already and you can look them up just as quickly as I can.But I will observe that from a recent stay in hospital I encountered clinical staff, from the surgeon downwards, from several countries, including Hong Kong, Philippines, India, South Africa, Zimbabwe, Australia, Nigeria, Spain and Hungary. So that's a part answer to one of your questions - they find work here.Perhaps you might find time to read the excellent John Harris, from my neck of the woods as it happens, here: https://www.theguardian.com/commentisfree/2025/feb/16/nhs-britain-immigrants-dad
Jonathan Callaway ● 417d