I'm now learning for my theory test and I found this about flashing your headlights (information is from "The Official DSA Theory Test for Car Drivers and The Official Highway Code" PC/CD)
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What do I do if I'm travelling at the speed limit and a driver comes up behind flashing their headlights or trying to overtake?
Keep a steady course and allow them to overtake. Don't try to stop them, they could become more frustrated.
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I'm never too sure when I should flash my headlights.
Only flash your headlights to show other road users you're there. It's not a signal to show priority or impatience, nor to greet others.
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