Wiggly Caterpillar.

Eye test this morning; no significant changes but, more importantly, no sign of nasties like cataract or macular degeneration.
Of with Chloe along the canal this afternoon, bright and breezy it was . Spotted this caterpillar crossing the path, well you could hardly miss it, about the size of my index finger it was.
Not a clue what it should metamorphose into, any lepidopterists out there in blip-land?