Managed to do an international to international transfer between 2 premium members (different addresses). Took 20 min on the phone to the call centre - initially they tried to get me to use 'gift points' on the website but that brings up the points.com paid-for system. Eventually they checked their notes in more detail and just needed membership number/name/email of the destination party and the points were successfully transferred and showed up immediately. Not the smoothest process but at least it worked in the end!