A “callous” couple who exploited a 13-year-old boy to run heroin and crack cocaine from London to Kent as part of a county lines drugs operation have been jailed for a total of 12 years.

A “callous” couple who exploited a 13-year-old boy to run heroin and crack cocaine from London to Kent as part of a county lines drugs operation have been jailed for a total of 12 years.