@TP-Link I have managed to make some progress now. I have put the Virgin Router back in to modem mode and I have added a new network switch. Everything now before the powerline is working which is...

@TP-Link answers to your questions below... May I know the model number of your NVR device? It's Hikvision NVR When the Netgear switch is connected to the main Deco X20 via cable, did the main Deco...

@TP-Link I am not sure if the switch was visible from the Deco, i would need to retry it in moden mode again and reconnect. The switch is a netgear unmanaged switch (GS205 5 port) which i am changing...

NVR and Powerline only seem to work when connected directly to the X20 (which is connected to a Virgin Router in modem mode), however when connected to a swithc that's connected to the X20 2nd...