I wouldn't say it was illegal, I just cannot see being able to justify carrying it in public.
That's just my opinion.
I can appreciate it as a collector's piece or for cosplay purposes etc. it's stunning and clearly no more dangerous intrinsically than a large butchers knife.
It's just more dagger than bushcraft knife is all...
Of course one can't justify it! Never was a goal
I can neither justify my motorbike, but I still have it