I would send this.
Where is your son from - is Hackney unfamiliar territory.
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I am challenging the PCN because I did not not see the restriction signs owing to one sign being obstructed, and also because of the prevailing road conditions.
I have been been able to check the signs through a local contact and as you can see from your video the right hand sign was entirely blocked from view by a lorry on my approach, leaving only the left hand sign, which is located next to a bus stop sign and not so immediately visible.
As you can also see from the video, there were roadworks blocking one side of the road and I believe my attention was focused on safely navigating across the bridge
I feel it is unreasonable to enforce the contravention as the lorry was blocking one side, and also it was on the side turning through which one needs to escape from the restriction.
I appreciate the restriction is there for good reason and am upset I missed the one sign but hope you agree that the prevailing conditions warrant cancellation on this occasion.
I look forward to your positive reply.