By Blencowe
South Yorkshire,
United Kingdom 
the large moth i asked the question about had two claw like extensions and when i touched it ,it seemed to walk on them ,it has been suggested it was a deaths head moth
29 May, 2012
Answers
Have you tried google images for large caterpillars.....it will be intertesting to see what it turns in to
30 May, 2012
The Death's head hawk moth has a very clear yellow 'skull' pattern on its thorax. [Also quite rare in britain] The claw like extensions will have been the front pair of the 3 pairs of legs they have. Initially I thought you meant there was only one structure that is why I suggested the proboscis.
29 May, 2012