money bookers is the easiest way :)
the verification process takes ages and wiring in and out is three days a piece at best.
If you need to transfer from your UK bank to a Polish one open a sterling account with the Polish bank and wire transfer straight in. Should take no longer than five working days but usually three. The UK chrages should be less GBP - GBP.
The quickest way is Money gram (I think) via the post office. If you have a trustworthy frined or relative with the same UK bank account as you, you should be able wire transfer via on line banking in real time, ask them to visit the post office and send a money gram transfer.
FX Foreign Exchange companies are another option but i wouldnt bother with them unless youre moving atleast £2k.