@sruli I'm not sure if you've made representations but you're almost out of time. If you've not challenged yet, send this:
Dear London Borough of Haringey,
I challenge liability for PCN ZN11022819 because nobody prevented the CEO from serving the PCN at the roadside, in such circumstances service of a postal PCN is a procedural impropriety.
It follows that the PCN must be cancelled.
Yours faithfully,
Send this via https://haringey.tarantoportal.com/ and keep a screenshot of the confirmation page.