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and the other side of the door is a solid brick wall
Structural, you reckon? What I'm getting at is that the RSJ is probably simply supported on these walls... and it's a heck of an RSJ. Maybe put there when the room was knocked through in the past.
I'm pretty sure the single skin of bricks underneath it is doing nothing.
Is left of the photo the party wall with next door? And what's the wall like that has the door in it (on the right)?