Only thing can say is that plan your lessons. I was on the receiving end of a PhD student teaching a module for a professor on my Masters. Put it this way I had put a complaint in as the student rep. All I can say is observe some lessons, learn some teaching practices and remember this, BE THE DUCK!

Being patient is all you need, don't treat them differently, don't change your approach and don't single them out. The best thing you can do is talk to them at the end of the seminar and ask how they felt it went.

Anyone know what would be a suitable method to apply for a novel project (Energy Recovery for Municipal / Commercial Buildings) in sustainable energy? The problem I have is that the proposal I want to do has 0 (zero) research in that area, I can't find anything resembling what I want to do, it is so niche that it covers 3 different areas of Engineering (Mechanical, Electrical and Sustainable). The question is who do I aim it at?
the Prof/Doc with Energy background or Electrical background?

My background: Looking to find a PhD in Energy/Sustainable, Msc Mechtronics (Merit) BEng (2:2).

Yes I want to apply to a Oxford for fun.

Anyone know what would be a suitable method to apply for a novel project (Energy Recovery for Municipal / Commercial Buildings) in sustainable energy? The problem I have is that the proposal I want to do has 0 (zero) research in that area, I can't find anything resembling what I want to do, it is so niche that it covers 3 different areas of Engineering (Mechanical, Electrical and Sustainable). The question is who do I aim it at?
the Prof/Doc with Energy background or Electrical background?

My background: Looking to find a PhD in Energy/Sustainable, Msc Mechtronics (Merit) BEng (2:2).

Yes I want to apply to a Oxford for fun.