Possibly a bit narrow for a main entrance when you account for the frame - I'd hack off the plaster on the nib as much as possible and make the right hand panel (from outside) a little bit narrower - amount depending on you eye and level of OCD - I reckon with mine I could overlook about 50mm.
I'm going to have a look in the loft to see what's above the brickwork, I don't think there's anything, but removing the left side bricks would cause another job inside the hall where the Gas & Electric meters are.
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