Stage 1 — Informal challenge (the first 14 days)
When a PCN is issued by a council, you have 14 days to make an informal challenge and still qualify for the 50% discount if you lose. Write to the council citing one of the statutory grounds: signage defective, contravention did not occur, wrong contravention code, mitigating circumstances, or a procedural error. Roughly half of well-evidenced informal challenges succeed at this stage — the council just cancels.
Stage 2 — Formal representations (after the Notice to Owner)
If the informal challenge is rejected, the council issues a Notice to Owner (NTO) within 6 months. You then have 28 days to make formal statutory representations under Traffic Management Act 2004 s.73. The grounds are narrower at this stage — defects in the PCN itself, exemption, the keeper was not the owner. Around 30-40% of formal representations are accepted.
Stage 3 — Tribunal (the last resort that often wins)
If the council rejects your formal representations, you can appeal to the Traffic Penalty Tribunal (England outside London) or London Tribunals (London boroughs and TfL). Tribunal is free, run by independent adjudicators, and you do not need a solicitor. Around 45% of UK PCN tribunal appeals are upheld. If you win at tribunal the council must cancel the PCN — no further escalation.