I came across this on SimplyTV and thought it was interesting. Hmmmmmmm.
While watching the second episode of the latest series, the Mark Gatiss written The Hounds of Baskerville, we think we spotted a TARDIS in the opening scene. Here is a pic...
I also Took a 720p screencap of the Episode.
First is flash filled and fade corrected edited cap and I also included the original just to compare.