IG 'revised' the lows during pound flash crash last year and platform froze during the CHF crisis. I witnessed the pound flash crash unravel on IG, saw the lows, they were few hundred pips lower than other brokers. No idea whether this is a manifest error or how they settled with losing customers, but if anything that price was unsettling.
Those that had guaranteed stops probably survived, the rest probably lost their knickers.
