help identify large caterpiller (uk)

[Ilweran]

the caterpiller is about one and a half inches long.It has two eye spots on
each side  just behind what I would say was its head. It has a spur on its back
end. Colour wise its sort of black with creamy, mottled markings, almost like a
snake.

Ilweran
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donT geT senTimental. it always ends up dRRiveLLLL.  one day.   i am
goingtogrow wings.   a chemichal reaCtion. hysterical & useless. hysterical
&let down and hanging around. crushed like a bug in the ground.