Wasn't there a bias against the ones playing in England back then. Or have I dreamt that?
I'm sure I've seen somewhere that it was more to do with just the general infrastructure that surrounded everything back then. FAs didn't have the number of employees scouting games that we have now, and so relatively few players actually got watched regularly, exacerbated by the fact that there was no TV or video footage available of matches as there would be now. As a result, Scotland teams featured mainly those playing for Scottish teams, despite most of their best players at the time probably playing in England.Similarly, England teams always had an inordinate number of London based players as they were the teams that were easiest to go and watch, and who got the most press coverage.