Home Hubs have got something called "Smart Wireless". What that does is automatically choose the least congested channel. It can be turned off and a specific channel chosen, but I doubt many people do that. I wouldn't have thought it followed anybody around as such. My one has certainly chose a channel (6) which isn't being used by any other WiFi transmitters in the area.
Short of persuading neighbours to lock their WiFi to specific channels, there's nothing you can do about it.
Also, each BT HH will have 3 different SSIDs (in both 2,4Ghz and 5GHz if the latter is supported), However, they don't actually compete with each other in the sense of causing WiFi congestion as it's only one antenna. In most cases two SSIDs will be idle as it's to do with FON support.
nb. the other WiFi channels round me are 1 & 11m so it looks like they are all choosing the non-overlapping channels, probably automatically.
Edited by TheEulerID (Sun 08-Mar-15 16:10:33)