Yip Bo Ching and Yip Ching are different people!! Yip Ching is the son of Yip Man and Bother to Yip Chun (seen as the current Grandmaster). Yip Bo Ching is one of Yip Man's earlier students and followed him for around 15 years.
According to literature he met a challenge from Wong Shung Lung and beat him. Other than this, little is known about him or any of his students. I know of one who trained with him but he is retired to Canada.
I was trying to get more Information on the man and see if anyone on this forum had any........