LONDON — Research commissioned by BBC Worldwide shows the top 20% highest earners are fully engaged and readily reachable by mobile advertisers. “Senior executives – do they look at their mobile phones all the time? The answer is ‘yes’,” says Tom Bowman, VP Global Strategy & Sales Operations, BBC Worldwide. “Amongst affluent consumers groups, the mobile device turns out to be the device which is strongest at changing position of brand favourability. If you had an absolutely brand new mobile device, you are twice as likely to be impacted than if you just had an old smartphone. …