I can recommend you “fxcast.com”. I have been trading with them for some months. First only the demo version, now also live. Compared to all the bad things I am reading here and on other websites about forex brokers this one definitely stands out positively.
Although you don't get direct market access (since you are trading CFDs with them) order execution is almost instantly and at the shown price. So I guess there is no manual intervention. Only at times of bigger news the spreads can widen from 2 up to 12 on EURUSD, but get back to normal after 2-3 minutes. I also like the browser-based software which is easier to use than Metatrader and others. There are a lot of possibilities concerning indicators also. Demo has no time limit.
I withdraw money once (you can input the request directly in the application!) which took 3 working days to arrive with no problems.