Highway Code annex
3. Help those involved
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DO NOT move casualties from their vehicles unless there’s the threat of further danger. DO NOT remove a motorcyclist’s helmet unless it’s essential. DO try to keep casualties warm, dry and as comfortable as you can. DO give reassurance confidently and try not to leave them alone or let them wander into the path of other traffic. DO NOT give them anything to eat or drink.
The Highway Code · Annex 7. First aid on the road · 3. Help those involved