Re: The Five...err Four Doctors!
I don't think Terrance Dicks keeps much old paperwork (not enough room for it and a family back in the old days), so only if they're at the BBC written archives.
They certainly weren't at the BBC Script Unit or they'd have been found when it shut down in 1991 (or were destroyed when it was - only one final copy of each script was saved for archiving)... during that last week, you couldn't move for cult TV fans taking their last chance to raid every filing cabinet in search of anything they could find. That's when I found the first reference to the Six Doctors working title and - foolishly - assumed it was just a typo).
"Some days are better than others. They say that where I come from."
"Loudly, I imagine, on the day you left."
(Blake's 7 - Rumours of Death)