About growing figs against walls: mine are both in sunny corners against walls, but my sister-in-law's father was a fruit farmer in Kent, and I remember him showing me his fig field perhaps 40 years ago. He was growing figs like his apples, smallish trees well spaced out in an open field, not a wall in sight. As far as I remember, he didn't get a good commercial crop every single year, but in a good warm year they were well worth their space.