Going Really Wide

This shot required that bit extra width and height than I was getting with the 17mm TS-E, so I used the Sigma 12-24mm II DG HSM full frame wide angle lens and corrected the verticals afterwards in Lightroom.
It's not a lens I'd normally use for interiors but in this case it helped me show more of the context of the room, and illustrate what the client had to deal with in this listed building. 
I've marked with a frame roughly what I was getting beforehand with the 17mm shift.