A method to dissuade or prevent magpies from your garden would also dissuade or prevent song birds

"Condition 3 of this licence – which requires users to satisfy themselves that other appropriate legal methods of resolving the problem are either ineffective or impracticable"

Wouldn't that therefore mean, that as those methods were impracticable (you still want the song birds), you would have sufficient grounds to pop a lead pill in their (the magpies) lug hole?