It doesn't seem they're blocking it as some customers in the UK can still access the site. Have a read for yourselves in the comments section. Still a lot of unhappy people though:
thepiratebay still blocked here. This has been since Thursday. Getting nowhere fast with customer services although they said it had been escalated to another dept.
Still no access to piratebay. Emailing back and forth to customer services all weekend. I asked them if it was blocked and they didn't answer one way or the other. Hopefully they get it fixed soon.