The Hallaton helmet

[mcbishop]

That may well be the case Mike but that does not prove that they belong to that particular helmet, for not only is there no evidence for hinges but the angle of the brow would indicate otherwise.
Where it has the same kind of theme as we find on the Xanten and it's neck guard is similar with it being horizontal, unlike the Xanten its brow area has a slope therefore it cannot have had cheek plates I would think.

I think we have to trust the BM's conservators to have restored it correctly. They are amongst the best in the world.

Mike Bishop