The cheapest way i guess is to find somebody that is going over with an empty van or big car , perhaps one of the Poles who has bought a van or car to sell for parts in Poland , perhaps you can share costs with them....I am a Brit who is living in Poland , at some point i will be over in UK to pick up a Jeep cherokee to bring back to Poland , but i don,t know if it will fit in with your plans...which area of the UK are you at , and which area of Polska are you going to...? I am living in the Ostrowice area of Polska , and i will be going to the Leeds and Scarborough area of the UK , mind you i could make a detour i guess.....OOOPS...just realised you are in Canada...kinda out of my way a bit....sorry...