A former hospital director has been convicted of forcing a middle-aged woman to be her slave, in what is thought to be the UK's first prosecution for such an offence.

Saeeda Khan brought Mwanahamisi Mruke from Tanzania to Britain and made her work 18-hour days carrying out chores at her home in Harrow.

Campaigners claim hundreds more slaves could be kept in houses across the UK.

Guy Smith reports.