Not just WSL mate both of Ip Man's sons also teach the same, although at the same time it also extends the power generation theories and teaches how to generate power with a straight arm (which can then be added to the power gen methods of SNT and CK). I'd love to hear more about TST's thoughts on BJ ( and CK and SNT etc if they are different)
I'll just summarise it and give you the main bits , it's from old photocopied notes that someone gave me years ago from a lecture that TST gave.
As I said , the translation leaves a lot to be desired.
Siu Nim Tau- The primary function of Siu Nim Tau is to use the mind to control the moves so that they can form the steady structure of an arch.
It is also with this control over the mind that straight attacks can be launched with the strength of the whole body centering at the point of attack.
Chum Kiu - The forwarding step and the turning stance of Chum Kiu together with the moves of Siu Nim Tau , if maneuvering at the same time can create driving forces of at least two different directions.
For this reason it is called the two-way force.
The main function of the two-way force is to off balance the opponent.
When the opponent is toppling over , he is unable to maintain the move or force in the way he intends to.
At this critical moment , the opponent can be defeated easily.
A bit more on Bil Jee - Of the three sets of Wing Chun forms , Bil Jee is indeed the most powerful one.
Every move of Bil Jee consists of the functions of both defence and attack with tremendous power of destruction.
Hence Bil Jee contains the highest level of skill in Wing Chun.
Here he talks about the elbow moves in Bil Jee - In Bil Jee the elbow moves are repeated many times because they are important in the sense that the practice of them may enable the person, who is familiar with Chum Kiu's rotation on the horizontal plane with an axle, to rotate three dimensionally like a sphere having the centre of rotation at the centre point of the body.
As both elbows are rotated on a slant, and once getting used to it , one can at discretion, rotate the elbows to any direction at any angle.
Thats the main bits , but I'm sure stuff has been lost in the translation.