Oh yeah, I'd forgotten about those little cameos. Good job the Comic Relief episodes aren't accepted as canon, because the Doctor regenerated about ten times in one of them!
And you can't replace the Tardis, or the Tardis noise. The sound is instantly recognisable to anyone who ever saw the original series - as is the Tardis itself! In fact, the BBC recently won a legal case against the Metropolitan Police, because the image of the "police box" is now associated more with Doctor Who than with the police themselves.
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