Would anyone happen to know what the contractual tie ins are for home grads of the NHS funded tuition year....? I've got it in my mind that in return for 1 year of NHS funded fees they have to work for the NHS for 5 years?
No, this isn't the case. They have to do one year of foundation training to get full GMC registration, after which they can work in particular jobs or go overseas. They then have to complete a second year of foundation training to become eligible for secialist training programmes (medicine, surgery, psychiatry, emergency medicine, general practice, etc.). All this will take place within the NHS if they stay in the UK: I don't think doctors below consultant or fully qualified GP level will be employed by private providers.
When the current wave of expansion of medical school places was proposed, it was suggested that it should be paid for in part by students committing to work for the NHS for a minimum of 5 years after graduation or else repaying a proportion of the costs of their training (the Office for Students and the NHS between them pay about £33,000 to universities and about £70,000 to hospital trusts for the training of each medical student, compared to the £37,000 from the Student Loans Company that the graduate is liable to repay). The consultation on this did not reach an agreement on whether/how to implement it and then the government lit a fire under all plans, legislation, etc. for the foreseeable future by initiating EU exit, so nothing is likely to be agreed now until that has been sorted out.
If we leave the EU without a trade deal, or with one that makes the UK very much a third party, it's pretty much inconceivable that there will be an NHS by the time current applicants graduate, anyway. If we want to negotiate trade deals from our weak bargaining position we shall have to open up the healthcare system to competition from international private providers. The USA, in particular, will not agree to any trade deal that does not allow its healthcare companies unrestricted access to the UK market without "unfair" competition from state-funded institutions.