What is the US equivalent of Golden Syrup (UK)?
Honeycomb can be made with honey or molasses but the flavor will not be the same. There isn't a US equivalent - we have molasses, but it's darker. You can substitute corn syrup in recipes where it isn't the principal ingredient, but here that would not work.

That being said, my local grocery store has a British food section which carries golden syrup. You probably don't have to substitute, you just need to find it in your local grocer.