The queue at the security checkpoint is the visible part. The system underneath it is not.
Aviation Security Officers in the UK are licensed by the Department for Transport. Not trained and badged by a contractor. Licensed by the government. The distinction matters because the duty they carry is statutory, not procedural.
They screen passengers and baggage. They also manage airside access control, cargo security, and the physical perimeter of the aerodrome. A major UK airport has a lot of perimeter. Keeping it controlled at all hours, through all shift patterns, is an operational problem most people in the terminal never think about.
The pay runs from around £24,000 to £36,000. The legal responsibility attached to the role is not proportionate to that figure.
Lockerbie was 1988. The system in place today was largely built in response to it. The checks that slow you down in the terminal exist because someone understood what happens when they're absent.
Aviation security works best when it's invisible. When people are complaining about the queue, no one's thinking about what didn't happen.
The people making you take your shoes off understand exactly why it matters.