Others with more experience might be able to advise here.
Unlike its sister tribunal for outside London, ETA does not have a library of TMOs deposited by councils, therefore what's presented is what adjudicators see. But they also don't like it if an appellant raises substantive issues at the hearing alone about which they were aware sufficiently in advance to give due notice to the council and tribunal. As it's likely that the council would not attend the hearing, the adjudicator could adjourn and direct the council to provide the substantive parts of the Order. How would this suit you?
On balance, I would advise that you submit this point in your appeal - which would then of course be copied to the council who must then provide you with the necessary evidence in advance of the hearing. Remember, LATOR sets the minimum regulatory standard regarding 'traffic signs', but councils are free to add to their burden by placing additional duties upon themselves within an order.
