We just went home...
We lost the fibre (and SIP trunks) to begin with. The power went sometime later.
We've already been warned that the fibre is likely to be down over 24 hours, so if we do have power in the morning then I get to finish off reconfiguring the firewall to use the old ADSL set up. If not then it's VPN direct to the data centre for our key people and I can kiss goodbye to taking next week off.
Joy...