It's not a court, it's a tribunal, and personal hearings are now by video-link or telephone.
Please show us the letter you should have received from the Tribunal with the date of your hearing.
I am assuming that you entered the schhol street at this point
https://maps.app.goo.gl/MZDGgE24XTUfvn9M6
and I presume that the signs in GSV have been replaced by some school street signs.
Please can you take a photograph of the actual signs you passed?
Why is this important?
Because, looking through the LBBD document that Stamfordman found I noticed this:
Access restrictions do not apply to residents living inside a School Street and the schemes only operate
on weekdays, during term-time. Click the link below for school term dates:
School term dates and planned closures | London Borough of Barking and Dagenham (lbbd.gov.uk).
Your photographs will show us how LBBD conveyed to a driver that the restrictions were in force on the day and time in question.
I by chance stumbled across this from
https://www.havering.gov.uk/downloads/file/96/policy-for-enforcing-or-cancelling-a-pcn
MC47 – Where the motorist enters a School Street Zone
MAY ACCEPT REPRESENTATIONS
Where the motorists holds a valid School Streets Access
Permit
Where the School required a motorist without a permit to
attend the School during the restricted hours (Letter from
School required to support this).
Is an Emergency Service or Public Service Vehicle.
Has a valid Health & Homecare Permit
Hackney Carriage, School Transport Vehicle, Dial a Ride
and other specialist transport services.
Marked Delivery vans eg Royal Mail, UPS, DPD.
MAY REJECT REPRESENTATIONS
In all other circumstances
N.B. This is from the L.B. of Havering. Try as I might, I cannot find a similar policy document for the L.B. of Barking & Dagenham, but they should have one.
It might be worth making a passing reference to this in any reps.