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Some international flights have face scanners at the gate. Not sure if it's to take a photo in the event of an issue or an actual scan and comparison against your stored ID, but the length of the process (a few seconds) suggests the latter.

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It's some combo of the latter. It's been a few years, but the last time I went through Heathrow, my face was scanned at passport control (arriving from US) and then again at boarding (connection to Glasgow). The two photos didn't match enough and I was asked to stand aside while the gate agent figured out how to proceed (pull out passport for review).

[at least that's my recollection of what happened]

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