This is a really nice little earner for the council, and all legal too ! GSV is too out-of-date to show the NRT sign, but your photos show it is clear enough. I suppose when everybody in Barking and Dagenham has received a PCN here the revenue will dry up.
I have to say that I can't think of a strong appeal argument here, other than the YBJ markings may cause confusion. In fact, I think that argument has already been presented and the appellant lost.
Have you done a search on the London Tribunals case register yet to see what adjudicators have said ?