Nick Hewer and Margaret Mountford, Lord Sugar’s erstwhile Apprentice sidekicks, have developed a highly marketable double act, and this week (15 and 16 July) they used it to cast light – or to direct heat – on a highly inflammable area of British life.They took five sets of anti-immigration British citizens (all but one of them white) to London and introduced them to five sets of legal immigrants to compare notes. Nick and Margaret hammed up scripted arguments in taxicabs, chatted to the participants and took turns to read the voice-over. People were greeted on doorsteps, tea was drunk and there was a lot of terrible bouncy music. It was a bit like daytime TV, but with conflict. The personal encounters were also required to illustrate themes in the immigration discussion