Originally Posted by PPRuNe Radar
Both yourself and Robin misunderstand how charging works outside controlled airspace. If you are IFR above 5700Kg, then you are charged regardless by way of the en route charge. The UK unit charge rate is the same whether in Controlled Airspace or not, and whether or not you receive an ATC service.
Your point is a good one, but on a point of detail, charging applies to IFR traffic above 2000 kg and all traffic above 5700 kg.