Been like that for a year or two. It's in the other London airports as well, I think. When they scan your boarding pass as you get on the plane, it brings up your picture again, so they can see that it's the same person who went through security and got on the plane.
No ideas how long the photo's kept for. Makes sense to delete it once the plane leaves, but could well be kept indefinitely in case they need to check up on you.
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