By Yorkshire13
Middlesex and Dorset,
United Kingdom 
Are these MONARCH caterpillars that have eaten my verbascum? Lots more.
Yorkshire13
21 Jun, 2013
Answers
They are a moth that lives and feeds on verbascum, and will devour it, if you touch them they spit, it is called a mullein moth, you can google it.
21 Jun, 2013
That is my thought too check this site out
http://www.gardenersworld.com/how-to/problems/flowers/mullein-moth/406.html
21 Jun, 2013
Mullien moth caterpillas ????
21 Jun, 2013