@ Mugie:
FSA is a regulatory body from the United Kingdom (UK), now its name has changed to FCA (Financial Conduct Authority).
One of the FCA regulated ECN brokers and uses the Metatrader 4 platform that I know of is Admiral Markets UK Ltd.
@ suko:
Indeed, ECN brokers are currently still relatively fewer in number compared to other types of brokers. Traders are still less interested in ECN brokers due to the relatively higher initial deposit compared to non-ECN brokers, the presence of commission fees each time a transaction is made, and the prohibition of hedging.
In addition to the brokers we have referenced previously, brokers regulated by the FCA and offering ECN accounts are:
1. FXCM, headquartered in New York, USA
2. FXOpen, headquartered in New Zealand
3. Hantec Markets, headquartered in Hong Kong.