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There is a corner of Antarctica that is forever Britain. On the shores of Ross Island there are three wooden huts left behind by Robert Scott and Earnest Shackleton’s expeditions a century ago – a snapshot frozen in time. It is something of a miracle that the huts have survived, but now ice, winds, salt and warmer summers are sounding their death knell. Ironically, New Zealand is leading the fight to save them. Metals conservator Nicola Dunn is one of three experts sent out by the New Zealand-based Antarctic Heritage Trust to work for nine months to save artefacts left…