I thought the PVR of the 64 was 8, though? Or is the 9th one spare?I think the 64 has a PVR of 8, so the spare will likely to see use on other services.
Belmont currently has 10 Darts for the 64's PVR of 8 but sometimes pops up on other routes such as the 6, 49/49A and 56/57/57A/86.