For some reason British people cannot grasp other channels, we have this discussion on Digital Spy and it appears to come down to these factors:
People who are so obsessed with the tv licence they will only watch BBC-1 as that's the premier channel and they say they want there money's worth
People who genuinely do not explore other channels some people admit they have never gone above 3 on the remote
Care homes, business who just switch on the tv and leave it on BBC-1.