Huh? I'm only able to get a single /64 with Sky. If I enable PD then I get nothing. Perhaps this is the fault of the Unifi Dream Machine's poor IPv6 support... maybe I should take another look?
I thought the same with my ISP, but it turned out it was pfSense who didn't do the right thing or something. Switched to OpenWRT and I got a /56 right away.