When One Wheel Costs You a Parking Fine: The Caldecott Road Case Explained

A Trap Most Drivers Would Never See Coming

Picture this: it's Sunday morning, you're heading to work at one of London's busiest hospitals, and you park on a residential street where the signs clearly show restrictions only apply Monday to Friday. You're confident. You've read the signs. You've done everything right.

Then a Penalty Charge Notice appears on your windscreen.

This is exactly what happened to a driver working at King's College Hospital in Lambeth — and their subsequent appeal to the tribunal reveals a set of rules that catch out even the most conscientious motorists. The case touches on double yellow lines, procedural fairness, and a legal principle that surprises most people: one wheel is all it takes.

What Happened

The driver parked in Caldecott Road, a street in the London Borough of Lambeth, on a Sunday. The road has resident parking restrictions that operate Monday to Friday, 8.30am to 6.30pm — and the driver had photographic evidence of the signs to prove it.

The original Penalty Charge Notice (PCN) issued by a Civil Enforcement Officer stated the contravention as: "Parked in a restricted street during prescribed hours." On the face of it, this seemed straightforwardly wrong. It was Sunday. The prescribed hours weren't in force. The driver had a solid case.

But here's where things got complicated.

When the driver challenged the PCN through Lambeth's internal appeals process, the council changed tack. They shifted their justification to a different contravention: parking on double yellow lines. The driver, understandably, was furious — and argued this switch was procedurally improper. They also submitted photographic evidence suggesting it wasn't entirely clear where the parking bay ended and the double yellow lines began.

The appeal went to an independent adjudicator at the London Tribunals. It was refused.

The Arguments

What the driver argued:

The driver made three distinct points, each reasonable on the surface:

1. The original contravention was wrong. The prescribed hours for Caldecott Road are Monday to Friday only. Parking on a Sunday simply cannot constitute "parking in a restricted street during prescribed hours."
2. Changing the reason mid-appeal is procedurally improper. If the council issued a PCN for one thing and then switched to a completely different justification, that should invalidate the charge.
3. The road markings were unclear. Photographic evidence suggested the boundary between the parking bay and the double yellow lines was ambiguous, making it unreasonable to penalise the driver.

What the council argued:

Lambeth maintained that the contravention code used — "parked in a restricted street during prescribed hours" — actually covers both single and double yellow lines. They argued the vehicle was not fully within the resident parking bay, with at least one wheel resting on the double yellow line. Double yellow lines, they noted, apply at all times, including Sundays.

The Decision

The adjudicator refused the appeal.

Having reviewed the photographic evidence, the adjudicator was satisfied that at least one of the driver's wheels was on the double yellow line and that the vehicle was not fully and correctly parked within the resident bay. That, in the adjudicator's view, was sufficient to justify the PCN.

On the procedural impropriety argument, the adjudicator found no fault. The contravention code used by Lambeth was deemed to encompass double yellow line parking, so there had been no improper switch in the legal basis for the charge.

The appeal was dismissed.

The Legal Reasoning — In Plain English

Let's unpack the three key legal points that drove this decision.

1. Double Yellow Lines Apply 24/7 — Full Stop

This is perhaps the most important thing any driver can take away from this case. Double yellow lines have no time-based restriction. Unlike single yellow lines (which operate during specified hours shown on nearby signs), double yellow lines mean no waiting at any time, on any day, including bank holidays and Sundays.

Crucially, double yellow lines do not need to be accompanied by a sign to be enforceable. The lines themselves are the restriction. If you can see two yellow lines at the edge of the road, assume they are active right now, regardless of what day or time it is.

2. One Wheel Is Enough

Under UK parking enforcement rules, a vehicle doesn't have to be fully parked on double yellow lines for a PCN to be valid. If any part of the vehicle — including a single wheel — is on the lines, the contravention has occurred. This is a rule that trips up a huge number of drivers who believe they've parked neatly within a bay, only for an enforcement officer to note that a tyre is touching or overlapping the yellow lines at the edge.

The lesson here is that parking bays and double yellow lines often sit very close together, and the margin for error is essentially zero.

3. The Contravention Code Was Broader Than the Driver Realised

The driver's strongest-seeming argument — that the council had improperly changed its reasoning — ultimately failed because of how parking contravention codes work in practice.

The code for "parked in a restricted street during prescribed hours" is used by London councils to cover a range of on-street parking restrictions, including both single and double yellow lines. The adjudicator accepted that this single code legitimately encompasses double yellow line contraventions, meaning Lambeth hadn't actually changed the legal basis of the charge — they had simply clarified which restriction the vehicle had breached under that code.

This is a subtle but important distinction. The code on the PCN acts as a broad category; the specific restriction that was breached sits within it. Drivers who receive a PCN with this code should not assume it relates only to time-limited restrictions.

Lessons for Drivers

1. Always Check for Double Yellow Lines, Not Just Signs

Before you park, look at the road surface, not just the signs. If there are two yellow lines at the kerb edge, they apply at all times. Signs are only relevant for single yellow lines. Don't let a sign showing limited hours lull you into thinking double yellows are switched off.

2. Make Sure Your Entire Vehicle Is Within the Bay

When parking in a resident bay or any marked bay, ensure every wheel — including the front and rear outer wheels — is fully within the painted lines. If your vehicle is even slightly over the edge and onto double yellow lines, you may receive a PCN regardless of whether the bay's time restrictions are in force.

3. Unclear Markings Are Hard to Win On

The driver argued the boundary between the bay and the double yellow lines was unclear from the photographic evidence. This is a legitimate line of argument in some cases, but adjudicators will look carefully at the photos submitted. If any part of the vehicle is visibly on the lines — even partially — the ambiguity argument becomes very difficult to sustain. If you genuinely believe road markings are unclear, photograph them from multiple angles before you leave the vehicle.

4. Understand What Contravention Codes Actually Cover

PCN contravention codes are broader than they appear. If you receive a PCN and you believe the stated reason doesn't apply to your situation, it's worth investigating what else falls under that code before assuming the charge is wrong. What looks like a mismatch between the stated contravention and the actual circumstances may simply be a case of the code covering more ground than you expected.

5. Procedural Impropriety Arguments Need a Clear Error

Challenging a PCN on the grounds of procedural impropriety — essentially arguing the council made an administrative error that invalidates the charge — can work, but only where there is a genuine, clear-cut mistake. A council clarifying which restriction was breached under the same contravention code is unlikely to be treated as a procedural error by a tribunal.

The Key Takeaway

Double yellow lines are always on. It doesn't matter if it's Sunday, a bank holiday, or 3 o'clock in the morning — two yellow lines at the kerb mean no waiting, period. And if even one wheel of your vehicle is resting on those lines, you can be fined. The signs on the wall tell you about time-limited restrictions. The lines on the road tell you about absolute ones. Learn to read both — and make sure your parking is completely within any marked bay before you walk away.

This driver did almost everything right. They read the signs, they checked the hours, they parked on the correct day. But one wheel in the wrong place undid all of that. In parking law, the margin between a valid park and a £130 fine can be as narrow as a tyre's width.