Most people get headaches because their eyes can not focus properly on the generated images. Eye muscle health plays a huge role in both comfort and the ability to see 3D. To compensate for "normal" eye damage they can use faster frame rates, reduced depth, and high color separation. There are many studies on this, remember that stereo viewing goes back 30+ years. Longer if you count the old analogue systems. (Analogue is the old cardboard glasses with red and blue plastic lenses).

England, as you may be aware, is often cold. A bird could easily decide to perch next to a chimney to keep warm. It then passes out from carbon monoxide inhalation, and topples into the chimney, where it becomes lodged.

My solution would be to mount even more powerful lasers on some of the aircraft. Fight fire with fire. Plus, it would just be cool.