Well, i managed to, i believe successfully, repot all three of the orchids, who seem to be quite happy in their new media/pots.

Hopefully the dying one will make a comeback, it was suffering from fairly severe root rot and I clipped away all of the rotted roots, it still had about four left, with the new media, will it make a comeback?

I'll upload pictures later, they look much happier to me!

Thanks for your help.