Re de minimis, with respect the wrong signs are being looked at.
While the 'zone end' signs draw the eye, the No Entry signs are actually separate and sit further forward, in fact almost in line with the road markings.
Virtually the complete van was in contravention. De minimis is a no-hoper.
Also, GSV is only 1 year old and shows the No Entry signs and IMO and adjudicator would accept this evidence, which they could find for themselves, as proving that these signs were in situ using the balance of probabilities test.
What the hell the end of Pedestrian Zone signs refer to, I've no idea. I cannot find else anything which corresponds, but it's not germane to the OP's case.