Quote:
Originally Posted by RichardCoulter
I thought this too and assumed that eg all the BBC1, ITV regions would be carried everywhere and only appear on the EPG in the relevant areas.
However, I was told that, like the local TV channels they are only inserted into the headend in the appropriate places 
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I was referring to the national channels on TSids 1 to 45. As you say, regional variations and local channels are inserted onto regional transport streams at the regional headend. TSid 101 carries BBC regions and local TV stations served by the regional headend plus RTE in Northern Ireland. TSid 102 carries ITV / Ch4 (regional advertising) variations served by the regional headend plus, I think, TG4 in Northern Ireland. TSid 104 carries regional BBC One / ITV HD variations. Obviously, the channels carried on these transport streams will be different at each regional headend. There's no obvious reason for regional headends to vary the content of the transport streams (1-45) carrying only national channels.