I have to say I don't see a robust appeal to take to London Tribunals, sorry to have to say it. I say London Tribunals, because the council will refuse your representations no matter what you say. You came out of a signalled junction, yet say you looked right for traffic. You were proceeding on green signal, so traffic from the right would have been stopped at the traffic lights so no need to look right at all.
At 0.09 of your video, the NRT sign on the central reservation comes clearly into view, (even though it is night). I agree the one on the left is not visible, but you did have plain view of one of the signs.
In terms of the adequacy test in Regulation 18 of The Local Authorities’ Traffic Orders (Procedure) (England and Wales) Regulations 1996, I think the council have erected "adequate" signage indicating the restriction. What more do you think they could have done ?