Guess who?

I found this little fella amongst some dead heather on Colonsay on Wednesday. The heather was quite young, yet great blocks of it were brown, particularly the north facing slopes, could this be an effect of the large numbers of heather beetle in the Spring? Is there something else going on?

And who is he? An albino Emperor moth caterpillar? A very poorly one? I'd be mighty interested if anyone knows...

Crystal