Yes I know, another Doctor Who story, but what can I do? Following on swiftly in the latest string of announcements comes the news that the Doctor's full-time companion in series four will be none other than Catherine Tate, reprising her role from the Christmas Special as Donna, aka the runaway bride.

If I'm honest I'm a little unsure about this - the Donna character worked well in a single hour-long episode but I can see her grating a little over the course of a 13 week run. However, Tate's a brilliant actor and more than capable of playing it straight, so hopefully the character will have developed a little and not be quite so... whiny, when she comes back.

Showrunner Russell T Davies says: "Catherine was an absolute star in The Runaway Bride and we are delighted that one of Britain's greatest talents has agreed to join us for the fourth series. Viewers can expect more ambitious storylines and a whole host of guest stars in 2008." That's all good then.