TfL essentially have said that yes. But would the London Tribunal? We know TfL don't have the greatest understanding of traffic contraventions, they reject appeals that would win at Tribunal everyday of the week except Sunday, but twice on Monday.
The road markings clearly contradict the signs on the traffic lights, had the road markings had supplementary writing saying "RIGHT TURN BUSES ONLY" I might be more accepting.
Because our head offices only sent me the NoR yesterday, the charge is already at £160. So, there is actually nothing to lose by appealing to London Tribunal.