Originally Posted by
warakorn
BA is liable for the actions and cock-ups it's service provider (in this case Heathrow Airport) is producing.
If the passengers had the right to enter (or remain if LHR was the starting point) in the UK from an immigration point of view, BA would owe them denied boarding compensation.
BA may try to get the money back from Heathrow Airport, but that's not the problem of the passengers affected.
That is true, but perhaps not in all cases.
People can genuinely fail conformance with the photo check - for example, they might be different people to the ones who passed security, or any other myriad of reasons.
Or, there's the possibility of a computer glitch.
This is not so much to do with the right to enter or remain (there is free movement domestically and to ROI) but with checking that the people who passed security are the people who are boarding the aircraft. Remember, no need for a passport for UK or ROI citizens.