Leaseweb is a server renting company. This means that BL uses Leaseweb servers is all. I know mr admin alasdair plays dumb here, but that's just what it is, it's not malicious.
Basically, your Peerblock lists suck, do not use the default ones. They also block OVH SAS which is completely retarded as OVH are an even bigger player in the data center business. I suggest getting ipfilterX and some entire country blocking ones for some obvious foes of liberty (any theocratic state, islam and judaism included, and many authoritarian ones are a great idea).