Forum:Is in-character linking narration canonical?

So yanno how BBC Video used to release incomplete serials with linking narration to cover the lost episodes? Sometimes, that used an actor who wasn't in character providing the narration, as with Tom Baker on Shada. But The Crusade release has William Russell fully in character as Ian Chesterton. They even give him a lower third which reads, "Ian Chesterton". So is that a valid image of Ian? And if so, doesn't it counter the Death of the Doctor notion that Ian never aged? And to the extent that there are other in-character linking narrations, do we take them seriously? 21:43:52 Thu 18 Aug 2011