Don't think Wagamama syns are published anywhere, but I would imagine it's one of the higher syn dishes. Why not try one of the clear broth soups, they're lovely! (not the one with coconut milk, as that will be high too).
Thanks for your reply! I figured it would be one of the higher syn value dishes that they have, which is why I need to avoid it next time I'll try one of the broths (Im not usually too keen!)