Change the last paragraph to:
I have since accessed images collected by Google maps and note that there was signage present on the offside junction of Watford Rd/Perrin Rd at the start of the scheme, but that at least from October 2022 the sign is rotated 180 degree and faces inwards towards the pavement. Hence on the occasion of the 4th July 2023 I was not made aware of the vehicle restriction due to inadequate signage, and for that reason the alleged contravention did not occur.
I would also delete the final paragraph as it is neither a statutory ground of appeal nor mitigation, and it won't make any difference to the outcome.