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Overload caused LSE closedown

The London Stock Exchange need not have used the system that caused the exchange to break down on one of the most critical days in its year.

The failure was caused by an overnight housekeeping system, which deletes old prices from the entire stock exchange trading system, taking longer than it should have done. This meant that when the London Market Link (LML), which sends data to members and vendors such as Reuters, started operating at around 5am on Wednesday, there was still undeleted data in the system.