Training
Training for a licence as you say must begin and end at a licenced aerodrome. Remember if you are acting outside of an AOC you must be exploiting the exemption given to training within a club. One member training the other. A ferry flight therefore isn't part of that and cannot count as instruction.
As for the Instructor, like any other pilot the time is logged from the moment the aircraft moves with the intention to fly and ends when the aircraft comes to a halt following that flight. Chocks off to chocks on in other words. A 'flight', it couldn't be simpler.
Is the ferry part legal? Of course it isn't without an AOC. However if you don't like the answer then don't ask the question. We may, due to the nature of things now have a running debate about this angle and that but just the same however it is dressed up someone is paying for the ferrying portion. Aircraft and flight don't come cheap.