(Bloomberg) -- Matthew Chamberlain had just presided over one of the wildest days in the history of metals markets when he sat down to type a late-night memo to the UK’s financial regulator. But the London Metal Exchange’s chief executive was optimistic.Most Read from BloombergThese Are World’s Most Expensive Cities for High-Class LivingNoises Detected in Search for Titanic Sub as Oxygen DwindlesHedging Failure Exposes Private Equity to Interest-Rate SurgeWhat We Know About the Missing Titanic S