Doctor-Donna (Updated)

I've now had a chance to read up on yesterday's news that David Tennant and Catherine Tate would be involved in the 60th Anniversary celebrations. I was curious to see that all of the images released on Sunday show Tennant out of costume, which made me think that they might not be appearing on screen at all - that it may be an audio piece or an animation.

However, I then read that the duo are:

“… filming scenes that are due to air in 2023 to coincide with the show’s 60th anniversary celebrations”.

This has got me thinking that it is either a mini episode such as The Night of the Doctor, or they are only featuring in a sequence which features within the overall 60th Anniversary story, like a flashback.

Russell T Davies is giving nothing away:

"They're back! And it looks impossible - first, we announce a new Doctor, and then an old Doctor, along with the wonderful Donna, what on earth is happening?  Maybe this is a missing story. Or a parallel world. Or a dream, or a trick, or a flashback. The only thing I can confirm is that it’s going to be spectacular, as two of our greatest stars reunite for the battle of a lifetime".

RTD said last week that there would be no more news for a while about the 14th Doctor, reminding everyone that Jodie Whittaker still has her final story still to air, for the BBC's Centenary in October. 

I can only assume that the reason this news has been released now is that Tennant and Tate are about to film their scenes this very week, possibly in a public location, which would have meant the news getting out unofficially anyway.

(It could also mean that they are not the only old Doctor / companion pairing we'll get to see - the others not featuring in a public location).

RTD said yesterday that Sundays were good days for making announcements - and so were Mondays...

Update: It's begun... Tennant and Tate seen filming at Camden Lock in London. Tennant in brown suit but with new dark blue overcoat.