Received the formal rejection yesterday (included in post above).
Highlights include listing signage on a number of adjacent roads not on my route (one which you could only make by driving through a barrier, and one road that doesn't even exist). The rejection letter also suggests motorists should check Newham's website - the same website that says they can't publish all the dates and that the signs should be used instead. It's all a bit farcical.
In any case, the inadequate signage on the route I took seems to have been ignored in the letter, so I guess we are going to tribunal.
I have the video and documents from my formal rejection still. I think I'll go back and get some better photos & video (day time), but apart from that is there anything extra I should be looking to put in my appeal? Is there any difference in outcome of postal vs in-person hearing?