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Bah!
I was basing that purely on finding these
https://www.wiggle.co.uk/ta-x110-outer-chainring-for-shimano-ultegra-6800But you apparently NEED the matching bolt cover here https://www.wiggle.co.uk/ta-ultegra-6800-bolt-covers for it to work
Bolt covers not in stock though and it leaves you looking for the 33t in stock somewhere
Edit - this gives you an idea of what they look like with the bolt covers
I think TA do them
edit - TA only seem to do 48/33, close enough?