Hard to get a grip on this one. On a superficial level, it seems both of them acted poorly. But there's no smoking gun and no real answer, so far at least, as to why they fell out so severely. Doubtless, it will all come out in the wash but, so far, hard to understand in full. Could well be missing something.
In 2000, the Court of Session held that Section 3(1) of the Race Relations Act 1976 applied in a case involving an English presenter and BBC Scotland as there were different national origins involved.