Definitely LM.....
Incidentally teusje and WK, thanks for the correction on the model number. Having done a bit of digging I see that PH-KOR was originally a II model and converted to a III. My photo was of PH-COR which I had recorded as a III but which is listed by Scramble as a CWH model, and looks exactly the same as the challenge aircraft! Anyone able to clarify...?