Yes some early Hub3's were white.
Hard to say re the electrics - hopefully someone else will comment. My powerline extenders do work but that's on upstairs and downstairs mains circuits. These are separate circuits as they can be isolated individually by the RCD's but they are in the same "fuse box" and so work ok.
--------------------
John
--------------------
I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router +2 Airport Express's. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.