I've traded CMC forex for a couple of years but today was the first time that I held a position over the weekend. They say they close at 5pm Eastern on Friday and this was confirmed by a message window at 5pm Eastern time that said CMC is now closed for the weekend. However prices continued to update for another half an hour. Does anyone know if these prices can be traded and what time do they open on Sunday (they say 4pm Eastern/9pm London time)?