Introducing a new tool for working out continuity that isn't continuous. 
Ladies and Gentlemen, let's have a big hand for the Nathan-Turner Principle!
> Doctor Who Fan: In Story X, Person A said N, but in Story Y, Person B said
>                 something that totally contradicted it. Please explain.
>
> John Nathan-Turner (producer of Doctor Who): Where is it graven in stone
>                                              that nobody in Doctor Who ever
>                                              lies?
IOW, "if you're told two contradictory things, see if there's some reason for 
one source to be unreliable.
This could easily shed light on some of the discussions I've seen running 
through this echo.
Paul
... Diana, Princess of Wales     1961-1997  
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