When I was a kid in the 80's I visited the old museum where they were actively spraying the ship, and I think they took that decision in the 70's, so I wouldn't be surprised if they know a lot more now about wood conservation.

Anyway, I think they're saying now that the biggest problem is that the old iron is reacting badly somehow, and they're thinking about - very carefully - replacing all the nails.

But the whole thing is very much a work in progress when it comes to conservation, no-one has done anything like this at this scale ever.