Free Traffic Legal Advice

There is a warning sign shortly before the turn, (see my post with the GSV links). I call these satnav-assisted PCNs !

it would appear that the person processing the photo just took a best guess…

An absolute disgrace and they should be hanging their heads is shame. Best guess, indeed ! Just serve a PCN and see what happens !! Clearly the Horizon affair is just the tip of the iceberg.

Very well done !  They collapsed when you held their hand to the fire with unrefutable facts.

Hi Incandescent,
No it’s not ALL we did we declared as sorn while we was awaiting for the new French registration to come through…. Write or wrong that’s not really the point… the vehicle was in France on the date of contravention.. that’s the point. However we have a made some progress in the last hour… will update later

Yes, I accept that, but if DVLA had your details still on their database as SORN in the UK, then when an on-line message came in from DART, they obviously have responded to it with the details, hence the pot mess you're now in, which you must exit from. Your case may have exposed a defect in the system, so keep us informed so others may benefit.

Please read this and update your thread as necessary: -
https://www.ftla.uk/civil-penalty-charge-notices-(councils-tfl-and-so-on)/read-this-first-before-posting-your-case!-this-section-is-for-council-tfl-dartme/

Do you see a basis to go and argue my case against the council?

None whatsoever from what you have told us so far, I'm afraid and sorry if this isn't what you want to hear.  This zone will have an unrestricted entry point so traders and couriers can access the properties within it, and you should have used this albeit it would be a slightly longer drive. Whoever you were visiting should have advised you of this zone.
However, there may be a defence if we can see the video. This will be on their website and accessed using PCN Number and car registration, so please supply these or download the video and post it here.

Anyway, assuming you drove in via Blackhorse Lane, here is the warning sign for a left turn: -
https://maps.app.goo.gl/HDPTerVW3DUGXKLF7
and here is a warning sign for a right turn: -
https://maps.app.goo.gl/5k4XfkxigPBZ3wzw7
and here are the actual signs you drove past: -
https://maps.app.goo.gl/yFgaxzvHSeEsqPi66
no times, so the restriction applies 24x7.  The signs mean "No Entry for motor vehicles" except what is shown in the box.

Stroud Road has no signs, so would seem to be the way into and out of the zone
https://maps.app.goo.gl/NvFVFiLcffBT96Zg8

Woodside Road is No Entry as it is one-way only.

You haven't said, but were you using satnav ?

"airbed"
??

+1
OK, I've also had a look at the video, and it shows you turning left and passing the restriction signs that are mounted at a "sky height" level.
Here is the view as you approach on Shacklewell Lane: -
https://maps.app.goo.gl/aAd7uNptEw3qKSSw8
As you can see the LH sign is hidden by the tree foliage. The other sign is visible. The only problem is that it is 20 mph here so in theory, plenty of time to see the sign and not drive into the street. Obviously you can submit reps based on your narrative here. You would need to emphasise the wasp distraction.

Would this be a winner at London Tribunals ? I don't think so, because the wasp distraction is mitigation and adjudicators are barred from considering it. Would Hackney cancel ? They may, so why not submit reps based on your narrative, and also the obscuration of the LH sign, and its very high position.