I live in an old house with thick stone walls - internally and externally. I have Fibre 100 broadband, and BT Smart Hub and Complete WiFi (3 disks) but the WiFi is still a bit "iffy" in some locations at times. The location of the disks cannot be made ideal because of the requirement to be plugged into a mains socket (which are a bit scarce in old houses). Is there any way around this?