The new research shows Mr Khan is preferred by inner London voters (47 per cent favourable to 42 per cent unfavourable, net +5) but viewed “unfavourably” in the outer boroughs (58 per cent unfavourable to 34 per cent favourable, net -24). He is far more likely to be seen as “favourable” by younger voters than older ones, being most liked by 25 to 49-year-olds. But among lower-income social groups, he is viewed far more unfavourably than favourably (59 per cent to 30 per cent, net -29).