He was also English native record holder*. [ See- Stanley Wilson (athlete) - Wikipedia]

* N.B. In the 1930's the english record could be held by foreign athletes and competitors from countries like Finland generally held the English record

I also found the following reference :
"Wilson was a student at Carnegie College in 1936-37 and was appointed assistant organiser of physical education for London County Council in 1939, still continuing to compete and winning the Southern javelin title the same year as a member of Southgate Harriers. His influential book entitled "A New Approach to Athletics", was also published in 1939, and he sub-titled it, "A practical guide for teachers, coaches and 'keep fit' leaders".

There is also a video of him demonstrating his javelin and discus technique at Carnegie College, Leeds in 1936/37
See- Stanley Wilson (athlete) - YouTube
It was the release of this video which caused various websites to jump to the conclusion that Stan, our PE teacher , was the 1930s javelin champion who competed for England at the British Empire Games (and the 1936 Berlin Olympics according to some).

I had a nagging doubt as to whether the Stan in the video and our Head of PE could in fact be the same person. On the plus side, the ages are about right. Stan in the Carnegie video bears a passable resemblance to the Stan the PE teacher I knew 25 years later but I am not trained in facial recognition nor do I have facial recognition software. I would need to know what happened to him between 1939 and joining WLHS in the late 1940s. Of course, WW2 was a great disruptor of people's lives and careers so it is not impossible.
I contacted a number of old boys to see whether any of them had ever heard this story while they were at the school. None of them had, even those who knew him in the late 1940s, only 10 years after his athletic success. How likely is it that this achievement by a staff member would have been kept quiet during Stan's long teaching career at the school?

Personally, I wanted the story to be true. Mostly because I do remember Stan teaching me the javelin in a very small group and thinking at the time that he really knew what he was doing. It came about because in 1963 I was excused PE following a cycling accident. In PE the first week after my accident, still covered in bandages, he told me to change into PE kit and just get some sunshine outside. The following week, he gathered me and a few other "malingerers" and gave us a javelin and discus training session, just like his "alter-ego" in the video.
It was a master class and when I saw the video of the other Stan Wilson demonstrating javelin technique at Carnegie it was an uncanny deja-vu experience.
[I wasn't the only one to make this observation: Incidentally, following your remark on how impressive you found Stan's javelin coaching yourself, I have clear memories of his explaining and demonstrating approaches to discus and shot in preparations for sports days, which that video also brought back uncannily]

Stan's coaching must have been effective because a few weeks later, at the school sports day, one of us threw the javelin much further than expected and almost speared the official, Ben Baldry, who ran away with unexpected alacrity to avoid being the first Latin master since the Punic wars to be impaled by a javelin! Ben must have achieved his "personal best" for running that day.

Generally, Stan didn't do much coaching on gymnastic or athletic techniques or use of the sports equipment. The pommel horse in the gym for example, shown in the 1907 photo, was never used during my years at the school. He taught us to shin up the ropes in the gym (handy for those boys planning to join Nelson's navy) and how to do the high jump, long jump and triple jump in the sandpit.
"Stan Wilson demonstrated the western roll once at the sand pit, by picking up the smallest boy on the scene called Gilligan, and rotating him in slow motion, before holding him horizontally over the top of the cross bar."

A few months ago I included a picture of the junior choir as photo of the month but what grabbed my attention was the javelin trophy mounted on the back wall behind the stage in the school hall. I must have seen this nearly every school day for about 6 years but I had completely forgotten about it.

Anyone recall what this trophy was awarded for -Maybe you won it?

Stan or Superstan?:The Hard Evidence.

So far the case for Stan Wilson ( PE teacher at WLBHS from 1947 ) being a medal winning javelin champion in the 1930s is circumstantial to say the least. A definite maybe then! Hence, additional provenance was needed for an old master!
I spotted the discrepancy in the initials fairly early in this saga. But with additional sleuthing from a number of old boys we have managed to fill in some biographical details of both Stans.

Athletics career
A British javelin thrower who set an English native record at the 1937 AAA Championships, Wilson won all three regional championships: the Northern in 1931 and '32, the Midlands every year from 1935 to '38 inclusive and the Southern in 1939. He represented GB on only 2 occasions coming 4th against Italy in 1931 and against Finland in 1935.

Career
He was a student and then a lecturer at Carnegie College of Physical Education, in Leeds in 1936-37 and became a notable coach. Appointed assistant organiser of physical education for London County Council in 1939, still continuing to compete and winning the Southern javelin title the same year as a member of Southgate Harriers.His influential book entitled "A New Approach to Athletics", was also published in 1939, and he sub-titled it, "A practical guide for teachers, coaches and 'keep fit' leaders".

Career

1947-1987 Head of Sport and Physical education at WLBHS Also taught English and was head of the lower school.

He coached the Badminton Team and ran the Friday night swimming club held at Armley Baths. He also ran a successful competitive swimming team.

Personal

He married Jane Ingram in Cleveland in March quarter 1940

Conclusion.
It's pretty conclusive ( whatever Facebook or Wikipedia say ) that our former PE Teacher W.S.Wilson was NOT the medal winning english athlete from the 1930s. Sadly he never competed in the British Empire Games or the Berlin Olympics.
So not Superstan then, but it is very clear from my own recollections and from the correspondence about Stan I have received while researching this that he was a well-liked and respected teacher remembered with considerable affection by the generations of West Leeds Old Boys who were taught by him in his 40 years at the school.

Credits.

Thanks to all who helped me with information about the 2 Stans:-
Ray Peat, Richard Collier, Alistair Duckworth and David Handforth.