A black-market trade in delivery app accounts allows underage teenagers to sign up as riders, the BBC has found. The family of a 17-year-old who died while working as a Deliveroo rider - despite 18 being the minimum age - say the company is "unaccountable". The Home Office is urging Deliveroo, Just Eat and Uber Eats to reform policies that let riders lend accounts to others, known as "substitution". Deliveroo says it has high standards and "robust criteria" for drivers. The BBC's investigation found substitution fuels an online trade in accounts, including potentially to children. Riders...…A black-market trade in delivery app accounts allows underage teenagers to sign up as riders, the BBC has found. The family of a 17-year-old who died while working as a Deliveroo rider - despite 18 being the minimum age - say the company is "unaccountable". The Home Office is urging Deliveroo, Just Eat and Uber Eats to reform policies that let riders lend accounts to others, known as "substitution". Deliveroo says it has high standards and "robust criteria" for drivers. The BBC's investigation found substitution fuels an online trade in accounts, including potentially to children. Riders...WW…