Hello,
I am a final year medical student at Buckingham. Firstly, congratulations on your interview offer.
1) The University of Buckingham's medicine course is fairly new which means only one cohort have graduated thus far and my cohort would be the second to graduate in June this year. That being said, this is no disadvantage to any students as Buckingham Medical school received GMC accreditation which means that they would have to meet a certain standard before this was granted.
Having gone through the 4.5 year programme, I must say that the teaching quality is great and the university is well known for this due to its small staff:student ratio. More information which can be found here
https://www.buckingham.ac.uk/news/university-of-buckingham-tops-rankings-for-the-third-year-running-in-teaching-quality/Another thing is that the university now receives several applications for medicine entry which makes it now quite competitive as can be found here buckingham.ac.uk/news/medical-school-applications-up-25-as-course-receives-its-official-gmc-accreditation/
Like someone has already mentioned above, it doesn't matter which medical school you attend in the UK as all doctors will be applying through the UK Foundation training programme which is a points based system (awarding of points based on your performance at medical school + another exam called the situational judgement test)
2) The internships you are referring to is the Foundation training (FY1 + FY2) which Buckingham offers just as any other medical school in the UK. Home and International students are assessed on the same level and as mentioned above if you have a high points score (based off the system) you can rank your jobs and get your top choices
3) Yes you can practice as a doctor when you qualify (i.e enter FY1)
4) When you qualify from any medical school in the UK, there is no need to take the PLAB as long as the university is GMC accredited and Buckingham is.
All the best with your interview and PM if you would like more information.