Originally Posted by
kt74
Sorry, that's completely incorrect.
You say that, but then you go on to agree entirely with Karfa:
Originally Posted by
kt74
Biometrics were introduced in order to allow HAL/BAA to merge the domestic and international departure halls
No-one has suggested that biometrics are required to travel domestically as a matter of law, but they are required as a practical function of the terminal set up. Whether the terminal should be set up that way or not is pretty moot.