I had a look at the video on the Redbridge website, and, sorry to have to say it, the contravention is made out very clearly. You drove out of the side road into the box when there was no space at all for you to exit the box and stayed in the box for a considerable number of seconds.
However, it may not be game-over yet, because there may be a 'technical' appeal argument not related to the actual contravention based on council mismanagement of the enforcement process, or fatal errors in the PCN itself, (although the PCN looks OK to me). So wait a bit until others have had an opportunity to contribute, but don't miss any payment or representations deadline on the PCN.
