The traffic order is The London Borough of Hounslow (School Streets) Order 2021 (https://drive.google.com/file/d/1SEOaVzAk-njWvL8AeWdpwrxLhNAf5VKv/view) as amended by The London Borough of Hounslow (School Streets) (Amendment No.6) Order 2023 (https://drive.google.com/file/d/1MOAPvp7XD7SIHERDzij74Pj4HRtrLpKy/view).
The restriction is somewhere along here https://maps.app.goo.gl/Mst7njw9LopA59DF8 but google street view is out of date.
I'd go with the same representation I advised on the other thread, as John has already suggested:
Dear London Borough of Hounslow,
I challenge liability on the ground that the alleged contravention did not occur, if you maintain there was a contravention please would you provide evidence of the same.
Yours faithfully,
However what is your connection to the company? Is it a leased vehicle, is it a company that employs you, is it a company you own / are a director of?