THERE'S A SPOILER AHEAD ABOUT THAT EXTRA BIT OF CASTING NEWS. DON'T READ ON IF YOU DON'T WANT TO READ IT.

Is it time to call enough already? The last time we saw Billie Piper in Doctor Who, she was being left on Bad Wolf Bay with another copy of the Doctor, so she'd stop having to try and pop up in the main show. I liked the character of Rose Tyler, but even I'm beginning to tire of the ways in which she continues to be shoehorned back into the show.

For it's now been revealed that Billie Piper is the latest name to be added to the roster for David Tennant's final two episodes, which are currently going before the cameras. Due to be broadcast on Christmas Day and New Year's Day, it'll be an end of an era, as this marks not only Tennant's exit from the show, but also Russell T Davies', too. Piper has been spotted, and it was widely reported in the papers over the past day or two, filming scenes with David Tennant in Cardiff. I won't repeat the list of faces popping up in these two final specials, but it's on course to make the finale of season four look a little bit sparse.

HERE COMES THAT SPOILER

In a further piece of casting news, Claire Bloom has reportedly also been added to the cast for the specials. And she's reported to be playing the Doctor's mother. There's, of course, been no formal confirmation.

Also on board is Barry Howard of Hi-De-Hi fame, and rumours suggest June Whitfield might be making an appearance too. If there's any spare time to squeeze them in, that is...