Jofm5,
Same in the states with regards to "right-hand-rule" however from the last footage I am under the impression that the plane is turning into the helicopter from behind. The aircraft that is overtaking another, does not have the right of way even if it would come from the right (ie. should pass behind in that case)
For a helicopter-pilot to see and aircraft coming up from past 3 o'clock, as it looks in this case, is not easy. When I fly, my general scanning is the 180 degree arc in my path of flight, unless I have been warned by ATC about approaching aircraft in proximity in the process of overtaking me.
Also, the plane was climbing, so the helicopter clipped the right wing of the plane instead of the left one that was the closest.. This makes me think that the helicopter would easily come in a blind-spot for the pilot of the plane. Nose higher than in level flight, turning + factors as scanning his map, changing radiochannels etc.
Just my two cents