About Duncan Mercer
Duncan runs the data collection that sits underneath the cost tables. He built the sampling harness that records spreads on a fixed cycle across sessions and reconciles them against the statements from our funded accounts.
When a table on this site says a broker averages a given spread, that number came from Duncan's dataset rather than from a broker's published typical figure, which is usually measured at the quietest point of the day.
He also writes the periodic industry reports on pricing, execution and the drift in retail trading costs across the UK market.