This thread jumped to top of the list only because of another post made yesterday (but deleted) - hence the late reply
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It concerns me that Max has a CCTV system but has switched it off because the plugs were causing errors. Bearing in mind that I have a rough idea why he installed them in the first place, my worry is that in this case safety and security are being ignored for fear of the loss of some broadband speed.
I'm quite sure that his house isnt that large, but just wanted to check another solution has been found rather than just keeping the cameras off.
Is there not some sort of wireless relay system you can set up? I'm sure Max has plenty of other routers in his cupboard, so surely there is something that could even be set up quite cheaply.