As we know, some of the previous doctors had episodes wiped/destroyed.
Let's say you accidentally stumbled upon a previously unknown 'lost' Tom-era 4-parter. What would be your absolute ideal:
Which part of his era?
Which enemies?
Based on earth/with UNIT, or in space?
Which companions?
And the final question -- what on earth would you do? Would you go frantic posting about it on message boards, or keep it quiet?