You didn't make sure first? Unless you specifically bought a region-free (not commonly available, leastways not on the shelves of your local electronics retailer) player or one that specifically plays region 2 DVDs, you just flushed that money. Of course, if you watch DVDs on your computer, I suspect some clever geek has come up with a way to play DVDs from any region on the PC. Maybe. Google is good for you, and can help keep the wallet fat.
http://www.dvddemystified.com/dvdfaq.html#1.10
http://hometheaterinfo.com/dvd3.htm