None of this actually applies during the period of totality of course, it is perfectly safe to view the Sun after the Diamond Ring has vanished, but be aware of the Diamond Ring Effect at the end of totality, and divert your eyes before this occurs. You could even project the Sun onto a screen using a pinhole of some description . The disadvantage is that the image will be fairly small and faint. A better method, possibly, than the last-mentioned is to use a mirror to project the Sun onto a card, or wall, or whatever. But whatever you do, do not flash the mirror in people's eyes - please do not suggest this method to anyone who might be, in any way, immature in this manner.
Animals start reacting.
Shadows start to get sharp. I have heard claims that the Tamar Bridge will be closed on the day, although that would not be an insuperable problem given that the total eclipse is visible from parts of Devon. Intriguingly, the autobahn between Stuttgart and Munchen lies entirely within the zone of totality. On top of everything else, there is also an air show at RAF St. Mawgam on the same day. This show claims to be the world's biggest military show, with usually 100,000 visitors per day.