The problem you've got is that if your main point in the appeal is that the video doesn't show the sign, (like a helluva lot of other videos we see), the council can present photos of the sign in their evidence pack. In addition, the adjudicator can look at GSV same as us and see the sign. OK, the GSV view is for a particular month and year, but the civil law test of "on the balance of probabilities" applies, NOT "beyond all reasonable doubt, (the criminal law test).
The above will only be tested at London Tribunals as the council will just refuse your reps.
So my view is you need to find something else.