Actually a reconstruction of the trailer for An Unearthly Child. Fantastic Hartnell impression - I'd have believed it was his voice. Somebody send John Guilory to Big Finish immediately. http://www.youtube.com/watch?v=95W2XCRe6Vo&feature=share
Hartnell is a fake fan! He refers to himself as "Doctor Who!" (joking aside that is pretty damn good).
Very cool (except the lip moving trick, that was kind of creepy ). I got weirded out by the "Doctor Who beings on BBC television" because I expected them to say One, two, etc. I forgot there was only one BBC
It's strange, some people are utterly convinced, but others including myself have never mistaken it for Hartnell for a second. Personally I thought Jonathan Redwood did a better Hartnell for Altered Vistas Desert Island Discs recon, but I say that purely from memory. If Big Finish ever start using substitute Doctors in such a manor its the day I stop buying.
i preferred this one which appeared in the list of videos from the original link... http://www.youtube.com/watch?v=auUgnQ2qJFM