From the same company in about 3 months, yes, about two occurences. From another company a few years back, starting with 25 pounds deposit to 100 pounds (75 pounds profit) in less than 6 months, continually profiting, have stopped using that company, problem with compounding profits beyond maximum capacity.
I simply place a limit order far away with a stop if executed for the perceived high probability of retracement or reversal positions. I don't know any automatic method for arbitrage though.