With all due respect Whoppity that still does not say the 1hr Instructional flight has to be with a JAR Instructor.
As the content of the flight is merely to have received 1hr of Instruction of any kind, I don't see how we can argue that it has to be with a JAR Instructor?
It also does not have to be a JAR Instructor when training towards a JAR rating. Take the example of ICAO Instructors outside of the JAA area training for JAA licences and ratings. In the US as an example there are many FAA Instructors teaching towards JAA ratings not holding a JAA licence or Instructor rating.
Why should someone who for example has undertaken an FAA BFR which has a full safety orientated prescribed content and has flown for more than an hour as part of this not be credited for the training?
JAA Gold plating?