Professor Zoom wrote:
Well. Let's do the math, shall we? The first 11 go up at the END of August, yes? Then two months later... the end of October, the other one goes up. What's after October? November. The 50th anniversary.
"Hey kids (and geeks alike), just in time for the anniversary get your picture taken in a TARDIS!"
I don't think there's much of a conspiracy here.
These displays are not on ground level (I assume, from past precedent. Might be wrong), and not accessible without a cherry-picker, so doesn't quite work. Plus, if that was what it was for, they'd want it there all summer to catch the tourist trade.
Not that I'm endorsing any conspiracy theories. It's just a final display item to get a bit more publicity just before the special.