Depends on your provider how TV is supported to your line.
When I want to use TV from my operator it is done only with a special config, which is automatically downloaded to router via ACS (provider server for configuring modems through TR-069).
To do so I need to set factory defaults and it will connect to the server after line-sync and change config.
Otherwise I can manually configure internet-access, but cant configure separate VLAN ID and some other stuff (I even dont know whatever) to modem on my own.
Here in Austria even telephony via operator needs to be set by provider config as it is not running through IP datastream but in different priorized VLAN.
If I port my fixed net telephone number to an alternativ provider there wont be a problem to set up manually, as it will use ordiniary inband VoIP connection.
As I dont use IPTV I prefer manual config. Sorry that I cant help any more with your IPTV, dont know how it is done in UK or especially with your IPTV provider.
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