Fatsia Japonica

I have a Fatsia growing in a large pot on my patio. It's healthy with lots of new shoots coming through but something is eating the leaves. I can't see anything flying, jumping or crawling or any eggs. Ideas of what to do please, I've cut the ratty looking leaves off since taking the photos. 

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I've never seen it in Fatsias personally, but it would be my best guess.
I think, if it is that, you'll just need to remove affected leaves.
Make sure the container is large enough, and the soil is refreshed every year, to keep it healthy.
Fatsias don't tend to make good pot specimens though, as the root system gets too big to be well enough sustained. It would have to be an enormous container, or purpose built raised bed or similar.
Don't keep it in a sunny spot if possible, as it tends to bleach the leaves out too.
It isn't slugs. If slugs/snails ate Fatsias, I'd ever have any foliage on any of the ones I've grown
It's in a north east facing corner so gets a bit of sun in the morning once the sun is a bit higher in the sky. It's in the ground but being close to the walls I give it plenty of water and a feed.