Interesting to read Mike Small's speculation (taking his cue from Angus Macleod) that David Tennant might have a leading role in the No campaign during the independence referendum. As you might know, I'm a great fan of both Doctor Who and Tennant, but if he did end up fronting some kind of all-singing, all-dancing 'save the union' campaign, I fancy there'd be one rather problematical question he'd find himself faced with again and again -
If Scotland is such a "valued partner within the United Kingdom", why was it not considered possible or desirable for you to retain your Scottish accent while playing the Doctor, especially since your predecessor Christopher Eccleston was perfectly able to use his own Lancashire accent?
The Doctor is, after all, from Gallifrey in the constellation of Kasterborous, not from inner London, so a Ralston accent would have been just as appropriate as the Mockney one Tennant adopted for the part. Paradoxically, there's been much more of a Scottish element to the show since the moment Tennant left.