Solved the problem myself. I'm on windows xp and don't use IE. So I found a free http proxy specialised in fighting the annoying GFW
http://briteming.blogspot.de/2012/07/fookproxy.html, downloaded it, run it, set IE proxy to the right address and calibre is already fetching BBC news like a full featured diligent great software it is. Now I can use internet as usual for my other stuff instead of suffering through shaky vpn connection in provincial hotels.
Here is to the speedy end of that nasty regime!