Worked in a building in Paddington where the local 'leccy board managed to connect the building's supply across 2 phases, so again 415V.
AFAIK most of the kit survived (it all did on our floor) but we did spend a lot of time (and petty cash) traipsing up and down the Edgware Rd buying up their supply of various fuses
(this was back in the day when every other shop on that stretch of Edgware Rd sold electronics of one kind or another)