For BT TV usage please avoid the Deco Mesh solutions unless you intend to use them in Access Point mode keeping the BT hub as the router. As a result functions such as parental control, threat prevention and QOS will not be available in this mode.
Having read up on several threads around this issue I performed some experiments and concluded that the Deco solution while running in Router mode does not support IGMP Snooping which is required for BT TV to work - particularly BT sport's channels. When in AP mode and using the BT Hub as the router, BT TV will work when connected to a Deco AP. The IPTV functions do not help with this.
This is a significant problem for the UK user base who use BT TV. Looking at the other threads relating to this issue, they stop dead as soon as IGMP Snooping is mentioned without confirming the lack of support.
@TP-Link, Deco mesh is a great product and I have deployed it in AP mode in a number of locations that use BT TV, due to its strength as a basic WiFi mesh solution but the loss of these great features and having to keep the terrible BT router running is a real let down. Please invest in including IGMP Snooping in the next firmware release for Router mode to address this issue for the UK.
For clarity the M5 supports IGMP in switch (access Point) mode, but not in Router mode.