Comics industry insider and long-time Doctor Who fan Rich Johnson casually dropped this little bit over at his Bleeding Cool website:
Now, the only thing that makes me wonder if this is true is that it might be difficult to film in and that Johnson does have a fairly good track record regarding Who spoilers (he did get it right before most that the Doctor was the one to be locked up in the Pandorica and that there may have been more than one Doctor running around in various episodes)...
http://www.bleedingcool.com/2010/08/05/the-toy-thats-bigger-on-the-outside/Rich Johnson said:DoctorWatch: It was a pig to film. The shooting angles were all wrong. There were too many reflective surfaces. And they’re changing it next year. But dammit I thought the fifth series TARDIS interior was very very cool indeed...
Now, the only thing that makes me wonder if this is true is that it might be difficult to film in and that Johnson does have a fairly good track record regarding Who spoilers (he did get it right before most that the Doctor was the one to be locked up in the Pandorica and that there may have been more than one Doctor running around in various episodes)...