[An autist writes: there are no poisonous snakes that would make you ill if you ate them. There are venomous snakes that would make you ill if you annoy them!]
Adder¹
Meadow viper²
Black mamba
Russell's viper
Tiger snake
5 Italian operas
¹ Amazingly I have never seen an adder in the wild, although for many years I believed one slithered right past the toe of 15-year-old me's boot in the French Alps.
² What I now know actually slithered past my boot, once I'd established that there are no adders that far south. Meadow vipers are quite rare, apparently.