OK, the mad scientist style cackling is probably not appropriate, but yes - the new BT host links are up and working. This is one of the key steps in the upgrade plans.
Over the afternoon we are stitiching the network together one step at a time and testing carefully at each step. We may leave the final linking in of the existing rack until after 5pm. More to follow.
We expect to do an LNS switch to the new LNSs on the new host links later in the week.