A JAR license is an ICAO recognized license!!! I think there is probably more chance of me winning the lottery than MK getting a AOC from a JAR country. That might kill their DC 8s!
I 'guess' that those who get called for interview will have far in excess of the 500 hrs multi crew time! That is pure guess work though!
As I said earlier, there are far better job our there - widen your horizons!