What a load of bollox. Exactly why are they not entitled to it? If you use the airport facilities you play by their rules. If HAL or CAA or whoever require it as part of monitoring to improve service then so be it. Life is too short to get all pompous.
Maybe it is simply used for timing purposes from entering security to arriving at the scanner to give HAL advance warning when the time taken is starting to increase? To be able to better predict pax flows through security and deploy more resources accordingly? Gosh, how incredibly sinister is that, am petrified
You may be right. I suspect not as HAL had assigned a staff member to make sure every card was scanned, while only two staff members were on duty on that lane.
Anyway to try and minimize my pomposity I did end up handing over my boarding scan for the second scan. But in an petulant display of windbaggery I did lodge a complaint with the CAA.