Identification needed

Could anyone please identify this caterpillar for me? It is made up of a yellow stripe with a grey stripe underneath with red dots in it. It is hairy and it was feeding on my plum tree. Two caterpillars were found on the

Victoria Plum tree.
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Hi, hope this works - you might find the answer here;
Caterpillars -- identification guide -- Discover Life
It hasn't worked, thought it would be a link - if you google the above it is a site which asks Q's about the characteristics of the caterpillar then arrives at a number of possibilties with pictures.
Hope it helps.
I think it's a caterpillar of the Grey Dagger Moth
http://en.wikipedia.org/wiki/Grey_Dagger
Yes it looks like it thanks for taking the time to help