For anyone that is thinking of buying the BT Whole Home WiFi System, you dont have to be a BT customer for it to work on your home network etc. The 3 dish unit is compatible with all home broadband providers, so you can be a TalkTalk, Virgin, EE customer and the system will still work.
If anyone wants to solve any Wifi dead spots in their home or business, it would be sensible to try a Wifi Expander first. These units start from just £15 and will normally solve the problem for many, save you spending £300.