Is the internet archive blocked in the UK?

I use the internet archive every now and then - usually for getting copies of old, public domain books - but tried using it today and found out that i am blocked from using it by Comodo. I googled it to see if something had happened and came across this article:

Which mentions something about the conservative party trying to block access to their old speeches. Now have i got something wrong, or has a political party unilaterally blocked access to an important website just in case it might embarrass them??