Stuart Simmons, Director and Head of Currency at QIC, argues in the latest episode that not only is the London 4pm Fix not a good time to trade FX on behalf of investors, but that in fact it might be the very worst time to do so.  Expanding on this, he claims that order flow imbalance lead to herd behaviour amongst investment managers trading at the Fix that in turn causes market impact which negatively impacts execution outcomes. On top of this, Simmons makes the case that the interests of investors are misaligned with both asset managers and their counterparty banks when it comes to using the 4pm Fix as a benchmark.