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I'm on exactly the same boat, having received PCN nearby to brockwell park based off a single A4 sheet of the TTRO stuck on a pole near where I parked. No actual signage anywhere. Lambeth rejected appeals nonsensically. Adjucation by the tribunal set for  early december where I'm pretty confident of a win. Council's own traffic order itself says “will only apply at such times as shall be indicated by the placing or covering of traffic signs and ‘no-parking cones’.” None of which were of course present, which is why I parked there. Absolute nonsense.