"It certainly is not enough in our judgment that the point was not taken owing to a wrong or what turns out in the light of after events to have been a wrong tactical decision by the appellant or his advocate and certainly not enough that the admission was due to the lack of skill or experience on behalf of the advocate. It would certainly not we think be enough that the omission could have been made good had the Industrial Tribunal chosen to suggest the point for consideration to the appellant or his advocate."