This 2 tonne weight limit catches out a lot of people, (A Bentley Bentaga is over the limit, I believe !!), but I don't think there have been any wins on the basis of inadequate signage. As a delivery driver you're meant to know the max laden weight of your vehicle. For me, the signage is quite crowded with many symbols to be taken in and understood in a short distance.
If you submit reps based on being a stranger to London you might get a result, but TfL will have "heard it all before", so don't get your hopes up. There may also be a "technical" appeal based on TfL mismananagement of the enforcement process, so wait and see if anything is suggested, but if you're minded to pay the discount, don't miss that deadline, which you can work out from the PCN.
