I think you've been had Hawky! I'm sure that'll be from the Gattis docudrama - the guy on the left looks like David Bradley who's playing Hartnell. She doesn't even look like Billie Piper in that picture!
Edit: in fact, if you Goggle Image Search 'Adventures in Time and Space' you get a few behind the scenes images similar to the photo you posted:
Edit#2: http://doctorwhotv.co.uk/pics-from-an-adventure-in-space-and-time-51237.htm