Just to say few words about separation. What I have read somewhere above, I am not quite sure is correct. IFR flights are to be separated from A to E class airspace and separation is responsibility of ATC not pilots , except the second aircraft is in visual contact with one in front of and requesting VMC descent maintaining own separation. In that case separation is given to someone who request it. I cannot understand that somebody here can say that IFR flights in VMC conditions are separated by themselves. Where did you read it and where do you apply this kind of separation?
One more thing what I asked before. Aircraft on a radar vector is requesting to descent visually (in that case is going below MVA) but not requesting visual approach, would you allow him/her to do it or not?
Answer will be highly appreciated.
I do not expect answers based on national regulations of some countries. I expect answer based on ICAO rules and regulations.
Many thanks.