Just one other point James and depending on the trading strategies you adopt. Trade the same time each day.
The best time for breakout or momentum traders to trade is between 13:00 and 17:00 GMT when both European and US traders are in the market. 60% of global forex turnover happens during the London/US session.
The best time for range traders to trade is between 21:00 and 06:00 GMT which is where there tends to be little event of risk and Asian traders are in the market
