Most people now have access to the internet while they’re on the move, but if you come across someone who is suffering from an anaphylactic reaction to something, would you know what to do?
If they have an auto-injector, use that immediately, but make sure you follow the directions to use it correctly. Then dial 999 and explain that you think they’re suffering anaphylaxis. It’s important to dial 999 even if they say they’re feeling better.
The NHS page on Anaphylaxis has step-by-step advice if you do have access to the internet. https://www.nhs.uk/conditions/anaphylaxis/