EU English PvP clusters are two, yes, but one is populated, the other not.
As per Blue post:
The one with Flamelash and Dreadmist is the unpopulated cluster
Merge allPvE into one
Merge all PvP into one
Or make only one PvE server.
And in any case leave the RP servers alone.
This is simply not true. I can in my AH see auctions from the 2 other PvE servers.