It is true that the UK would be the last country in Europe to "benefit" from SOPA/PIPA, given its current legislation and its general preference to rather not alienate the US. On the other hand, there might be some significant opportunities for countries like Sweden or even Germany, particularly if the German Pirate Party (that originated in Sweden) should make it into the Bundestag/Parliament in 2013, which is entirely possible.
I do not know nearly enough about the deep technical and worldwide ramifications of SOPA/PIPA, but I can see how a bold legislative re-branding of said countries might make them a very attractive place to build consumer-facing web companies. Consider how Berlin has become a mecca for artists: it's not because it's cheap (it is, but there are plenty of cheaper big cities in the world), but because it's by far the most liberal large city in the west right now. ('Socially Liberal', that is.) If SOPA/PIPA or future versions of those should actually pass, places such as Berlin could "brand" themselves as the world's last safe havens for b2c web startups (excluding eCommerce, which would probably benefit of SOPA).
Ironically, this might just be the best argument to convince American die-hard SOPA-advocates that their plans are nuts: imagine a future where "socialist" countries like Sweden host the next Googles and Reddits.