Interesting. Can I just correct the Hoopoe bit?
""Natural predators are: Crested tits that will eat the eggs and very young caterpillars. Cuckoos that will eat the caterpillars. Hoopoes that will eat the pupa from the ground and most bats that will eat the moths.""
I'll look into the law, I suspect it may be rather like the "Chardon law" but a new one on me.
Chris