UK, Ireland /
Driving to Warsaw from UK [13]
The route through Germany is easy, the Polish stretch is dull and, depending on traffic reports, not worth taking the Autostrada (A2) from Poznan to Strykow - your 33zl you pay in tolls won't get you any faster than the old E30 that runs parallel to it, if there's traffic.
If you do want to drive through the UK, a little-known route is go take the Transeuropa ferry from Ramsgate to Belgium (Zebrugge?) Four hours for 30 quid, and the M2 motorway gets you to Ramsgate very quickly. The Speedferries catamaran from Dover to Bourlogne-sur-mer is faster, but then you have to get out of that port, past Calais and into Belgium, which takes about the same time as it would have taken on the Transeuropa ferry.
If the roads are clear and you're feeling perky, you can JUST get from the English channel (be it France, Belgium or the Neths) to Warsaw in one day, but it's knackering and from a safety perspective, not recommended.