Almost forgot to mention...
Here's a tweet from Panorama researcher Jessica Benhamou. It offers an interesting insight into how BBC programmes like Panorama gather their cast-list of 'ordinary people':
PLS RT .@TherealNihal! BBC Panorama is looking for unemployed, Bangladeshi, 18-24 yr old men in E London. Email email@example.com
— Jessica Benhamou (@JessicaShiraz) February 11, 2015