Series 9 - More BBC Behind the Scenes Images

The Official Doctor Who Instagram Account is busy again - they've uploaded three more images.  Their previous images can be seen here.
 

The caption for the pic below reads: "before you ask what it is – we can’t say! But by all means have a guess! What do you think? A Time Lord’s shirt button maybe? 

And finally...we get a Capaldi pic with the caption: "Doctor Where? I know, too easy…"