Its pretty clear that under UK law the pirate party are not doing anything illegal and thus the threats of civil court action are simply made to test the resolve of the individual members, this divide and conquer approach is pathetic as well as likely to backfire on the industry as more members of the public will join in a "virtual jihad" against such attempted censorship and extortion.
Whats not been made clear anywhere is that the block against the pirate bay was undefended on various grounds as the blocking order was directed against ISP companies only and they did little if anything serious to fight the block, being after all neutral third parties, this wont be the case when the same method is tried on a political party, the media mafia extortionists can expect to face a serious amount of legal blowback if they actually start legal proceedings instead of making hollow threats for the past fortnight.