Oops.
Neighbour at the door early hours (04:00 ish)
Sparks and flame from cu.
Somewhat panicked!
By the time I got around there, the main fuse had gone, most damage to the spd, but full of arc residue on the rcbos around it.
Managed to save most of the board, but need new rcbo x 4 and the spd itself - at least I think it's not well!
Got most of it sorted in time, spen just round and replaced fuse, so some circuits back up now.
Rushed home to check my spd - all fine, so assume we are on different phases.