I am following the £:PLN pretty closely, and have made a few trades on the £ when either currency seems overly high.
I personally think it is very difficult to pick a direction. I like to follow the exchange pattern so that I get a feeling for the norm and then can react when there is any significant change. Currently the PLN has been around 5.5-5.11 but has recently really weakened against the £ in a big way - now 5.36 and looks like it is climbing higher.
I tend to view the binary option over a 10 year period to get an idea of the highs/lows in this timeframe.