> a mixed-genre channel, with versions for Scotland, Wales and Northern Ireland and variations for English regions and the Channel Islands, providing a very broad range of programmes to a mainstream audience;
As I said, the different channels are different services, which is partly the point. BBC Four's service description is, for example:
> a channel providing an intellectually and culturally enriching alternative to mainstream programming on other BBC channels;
Well I've gone one better than you by quoting the formal public service description that is part of the formal list of "UK Public Services" under the Agreement between the BBC and the U.K. Government. There are eight television services, not just BBC One as you had it, and they are different services on different channels.
> a mixed-genre channel, with versions for Scotland, Wales and Northern Ireland and variations for English regions and the Channel Islands, providing a very broad range of programmes to a mainstream audience;
As I said, the different channels are different services, which is partly the point. BBC Four's service description is, for example:
> a channel providing an intellectually and culturally enriching alternative to mainstream programming on other BBC channels;