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I would say eyed hawk moth caterpillar.
Brian, in regard to your tit box, is there a metal plate over the hole. If not, birds may feel at risk from squirrels and woodpeckers. Palustris, in spite of the damage I would be pleased to see badgers. Perhaps scones with jam might tempt them away from your plants? I have never seen a live badger. Plenty of dead ones as road and rail casualties. Most have been killed one way or the other in this area, many by illegal diggers.
!I thought it was a still-curled-up leaf! Fantastic camouflage!
Scones with jam?? I should be so lucky. Do they let it be known which kind of jam they would prefer? Apricot? strawberry? black currant? I expect home-made is best? And how about with whipped cream too?