Prague is such a staple destination- it really needs a service from Liverpool. Ryanair doesn't do Prague in the Czech Republic, only Brno- I don't see a big market for Brno flights (hmmmm, I didnt see a big market for Tampere flights either, before today!), so maybe it would have to be an Easyjet route.
I really wonder if Easyjet will retract from Liverpool, in favour of Manchester? Ryanair was little threat until now, by flying to different destinations from Easy. Flying to the same airport of Krakow on the same days has to be a direct challenge- It will be an interesting few months, I reckon!