This afternoon I had future fibre installed to replace my standard talktalk broadband. I wasnt home during install so didnt get a chance to talk to the engineer. Ive arrived home to the eero 6 being plugged in and the network working (although the wifi range isnt as good as previous!) but the talktalk router hub is also still plugged in and working on the old wifi network. Is that neccessary or should I remove the old talktalk hub?