Hi Aj
I believe Lspacehopper no longer works for PAH.
PAH might advocate selling bunnies in pairs but 2 females often do not get along and will need spaying to have any chance of a happy relationship, the best pairing is between a male and a female but if PAH encouraged this and just told people to neuter/spay them, I expect they would find many people don't/don't do it in time, or mess up the bonding process and then there would be even more unwanted bunnies in the world.
When I worked there although it was some years ago they did not encourage male and female pairings.
Regarding accommodation, I actually think everyone is singing from the same hymn sheet here and to be honest I couldn't really tell much from your setup on your other post, but you will find the RWAF website very useful:
http://www.rabbitwelfare.co.uk/ which goes into more detail about bunny accommodation requirements.