[1/2] Traders work on the floor of the London Metal Exchange, in London, Britain September 27, 2018.
The world's largest and oldest metals market annulled all nickel trades in March last year after chaotic price action and suspended trading for the first time since 1988.
"It does look from the statement that the FCA is not going to look at the cancelled trades," said a regulation lawyer.
The LME faces lawsuits from U.S. hedge fund Elliott Associates and Jane Street Global Trading, which are suing the exchange for $456 million and $15.3 million, respectively, for the cancelled nickel trades.
"Neither the Bank of England or the FCA have been clear about whether the LME should have cancelled the trades," said Harold de Boer, managing director at investment firm Transtrend.