大象传媒

Sarah (not her real name) was 12 when she and her older brother got caught up in county lines drug-dealing.

County lines networks often operate by city dealers recruiting vulnerable young people from country towns and villages to distribute drugs.

Now 14, Sarah told 大象传媒 Radio 5 Live that she sometimes walked for up to three hours at a time to sell "the tiniest bit of weed".

This film is a reconstruction and Sarah鈥檚 words have been spoken by an actor.