Thanks, Jason, for the notice! I tried the Simulator and it is very useful!
The fact that you can replay actual market movements at fast-forward and then manually pause it to enter and exit trades according to one's trading strategy, and see the effects on the simulation's P/L is brilliant! Not only is it great for testing strategies, but it is a superb way of learning to trade "hands-on" - similar to a demo account but with up to 10x the speed, which means one can rerun the same periods over and over whilst optimising a strategy.
....and brilliant that these can be run over the weekend whilst markets are closed and there is time to concentrate of checking and developing one's strategies - thank you FXCM for this!
It would be nice if FXCM could also offer some better templates for setting up parameters for automated backtesting on the Simulator as well. The available ones at present seem quite basic - or have I simply not found them?