I interviewed for an advertised PhD and got an email thanking me for interviewing but advising that I wasn't successful. They encouraged me to apply for PhDs at other colleges and their college. I have actually already applied to another advertised PhD with the same supervisor (who knows I have applied), but don't know whether they just didn't like me as a candidate or did like me but had another better candidate. If the former, I won't be considered for PhD2 but if the latter I may be.
This was my first PhD interview and I want some feedback, whether it is about my performance at interview (too nervous, talked too much), or other factors affecting my rejection (lack of research experience, average scores in a particular module that required high scores).
How do I politely request this feedback?