wouldnt a train ride cost as much as a flight to Poland by BA or Lot? how long doesnt it take to get from UK lets say London to Waraw?
Hmm..I did it (nearly) in September on the spur of the moment.
Harwick-Hoek van Holland was 23 pounds walkup single
Hoek van Holland - Arnhem was 24 euro.
Arnhem-Berlin was 93 euro.
Berlin-Poznan was 22 euro.
That was walkup prices, so you should be able to find it cheaper, particularly if you don't travel IC/ICE within Europe.