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The index hit its highest level in over two months. Royal Bank of Scotland closed up 1.4 percent, after the US Department of Justice settled with Deutsche Bank with a smaller fine than had been originally proposed, prompting speculation it might also be lenient on RBS.
However, Barclays fell 0.9 percent after it failed to agree a settlement with the DoJ. The department has launched a lawsuit against the British bank, but Barclays rejects its complaint.
The FTSE 100 traded just 22 percent of its 90-day average volume. It only traded for half a day due to the upcoming Christmas holiday. Both Monday and Tuesday are UK market holidays.