Terrestrial broadcasters Carlton Television Ltd and LWT Holdings Plc have joined forces with cable television operator Videotron Holdings Plc to launch an interactive news service for London cable subscribers, which will start later this week: it’s not very interactive but viewers will be able to choose from four strands of programming during LWT and Carlton’s two local news programmes, to concentrate on weather, traffic, community and social action reports or the main news programme; the service will operate for six to 12 months and Videotron’s 65,000 London cable subscribers will be the target of constant market research to gauge their responses; later, viewers will be able to communicate with the studio, voting on programmes or the performance of the participants such as politicians interviewed on the news, or enter a competition.