Oh I've just spotted the video maker has said they were signalling. In which case, passing on the left is actually allowed. As it was done so early before the junction is a bit shady, but the intention to take the lane earlier still (wayyy more than 50m) invites passing on the left. This is London, wake up and work out who's behind you mate! Posting that video is sanctimonious rubbish. Get a life.
Oh I've just spotted the video maker has said they were signalling. In which case, passing on the left is actually allowed. As it was done so early before the junction is a bit shady, but the intention to take the lane earlier still (wayyy more than 50m) invites passing on the left. This is London, wake up and work out who's behind you mate! Posting that video is sanctimonious rubbish. Get a life.