The Telegraph reports that there is an LSE investigation into a ‘suspicious’ trading glitch

The exchange said preliminary investigations indicated that the human error “may have occurred in suspicious circumstances”…. Tuesday’s disruption marks the second glitch in less than a month. On October 5, a problem with a network card forced the exchange to shut the system for over an hour. Last month’s problem came only two days after Turquoise had moved across to the new technology platform.