Spirit Measures & Pub Law 2026

Last updated: 26 June 2026

Most pub licensees think spirit measure law is just about pouring the right amount. It’s not. The legal landscape around how you serve spirits—what you must display, what you’re allowed to charge, and how you track it—directly affects your trading licence, your takings, and your relationship with the local authority. And it’s more complex than the pubcos admit when they hand you the keys.

If you’re running a pub without a clear grasp of spirit measure regulations, you’re exposed to enforcement action, customer disputes, and silent stock loss that your spreadsheet will never catch. Most licensees don’t realise that poor spirit control costs them money twice: once through over-pouring (a free-poured 25ml is often 32–35ml in practice), and again through unmeasured wastage that goes unrecorded.

This article covers the legal requirements around spirit measures in UK pubs, why the law exists, what it means for your daily operations, and how proper measurement protects both your licence and your margins.

What Are Permitted Spirit Measures Under UK Law?

The most effective way to comply with UK spirit measure law is to use only 25ml, 35ml, 50ml, or exact multiples of these measures. These are the only legal spirit measures under the Weights and Measures Act 1985 and subsequent regulations. Any other size—20ml, 30ml, 40ml, or free-pouring—is unlawful, regardless of what your competitor down the road is doing or what your POS system defaults to.

The law exists because consumers have a right to know what they’re paying for, and local authorities are required to enforce weights and measures standards to protect that right. But here’s the operator insight that most landlords only learn the hard way: the law also exists to protect your margins. When you have a defined measure, you have a defined cost. When you free-pour, you’re bleeding money to habit, habit, and generous hangovers.

In practice, 25ml is the legal minimum for a single spirit measure. Some pubs use 35ml as standard (often called a “large” measure), and 50ml is common in upmarket venues. You can serve multiples—two 25ml measures, for example—but you cannot serve 20ml, 30ml, or 40ml as a single measure, even if your till is set up for it.

This matters because if an enforcement officer from your local authority tests your measures and finds they’re inconsistent or non-standard, it’s a breach of trading standards that can result in a warning, a financial penalty, or in serious cases, licence conditions being imposed. And once a condition is attached to your licence, every future renewal becomes scrutinised.

Why the Law Specifies These Measures

The measures were standardised in metric terms by European regulation and carried forward into UK law post-2020. The 25ml baseline came from public health and consumer protection frameworks designed to ensure fairness and traceability. When you use a legal measure, you can prove what you served. When you free-pour, you cannot.

That proof matters when a customer complains, when your till stock doesn’t match your physical count, or when an enforcement officer visits. And they do visit—especially in areas where there’s been a complaint or where the local authority runs a routine compliance sweep.

Display and Pricing Requirements

It is not enough to have a legal measure. You must also display it. This is a separate legal requirement under consumer protection law, and it catches many licensees off guard.

The spirit measure size must be displayed prominently at the point of sale—usually on the drinks menu, behind the bar, or on a visible price list. The display must be clear enough that a customer can see it before they order. If you’re using a digital menu or a till screen that doesn’t show the measure, you’re in breach.

Many pubs display the measure on the optic but nowhere else, which is not sufficient—the customer must be able to see the measure and the price together before committing to the purchase. This is why proper till configuration and menu design matter. A simple solution is to print a small notice showing “Single: 25ml £X.XX” or “Doubles available: 50ml £X.XX” and ensure it’s visible at the bar.

Pricing must also be transparent. You cannot charge different prices for the same measure depending on the spirit, the customer, or the time of day, unless you have a published pricing structure (e.g., “premium spirits 25ml £4.50, standard spirits 25ml £3.50”). Hidden or inconsistent pricing is a consumer protection breach and a licensing issue.

In my own pub, I found that simply printing a clear price list and laminating it at the bar reduced customer complaints by half and made enforcement visits smoother. It also helped staff upsell correctly because everyone knew the standard measure and could confidently suggest doubles.

Licensing Authority Enforcement

Your local authority’s trading standards or licensing team has the power to inspect, test, and enforce weights and measures compliance. This isn’t theoretical—enforcement is a statutory duty of UK trading standards services, and most councils run routine programmes.

An enforcement visit typically involves an officer checking your measures using a calibrated pourer or scale, reviewing your till settings, and checking your displayed pricing. If they find a breach, the outcome depends on severity:

• Informal resolution: A warning and request to correct within a set period (most common).
• Formal caution: A written notice of breach, recorded on file. A second breach within a specified period escalates.
• Prohibition notice: An order to stop selling spirits if measures are seriously non-compliant.
• Prosecution: In cases of repeated breach or deliberate misconduct, the local authority can prosecute under the Weights and Measures Act, resulting in fines up to £5,000 per offence or closure orders.

More importantly, enforcement action gets flagged on your licensing file. When your licence comes up for renewal, or if a complaint is made, the licensing committee will have a record that you’ve been in breach. This can affect your ability to renew, your terms, and your standing with the pubco.

Most enforcement visits are triggered by a customer complaint or a routine compliance sweep. The easiest way to avoid one is to have your measures, displays, and till configured correctly from day one.

How Poor Spirit Control Costs You Real Money

Here’s where the law and profitability intersect. A 1% stock loss on wet sales costs a typical pub £3,000–£5,000 per year. Most licensees assume that loss is theft. It rarely is. It’s usually a combination of over-pouring, unmeasured wastage, and measurement error—all of which are invisible if you’re not tracking spirits properly.

A free-poured 25ml measure is typically 32–35ml in reality, especially in a busy service when the bar staff are moving fast. That’s a 27% overpour. If you’re serving 20 spirits per night across a team of staff with inconsistent pours, you’re losing a full bottle per week to portion creep alone. Over a year, that’s 50 bottles of premium spirit unaccounted for in your cost of goods.

Using a calibrated jigger, optic, or scale brings that variance to near zero. And the financial impact is immediate. Most pubs that move from a messy spreadsheet to a disciplined weekly count recover 1–2 gross profit points within a couple of months. At a typical pub turnover, that’s an extra £2,000–£4,000 per quarter.

This is why StockTap pub stock app is built around weekly counting, not annual stocktakes. Weekly counts let you catch drift early—a 2% loss in week one becomes 6% by month two if you don’t intervene. Monthly lag is too long. You lose the ability to identify which staff member, which shift, or which spirit is leaking.

Spirits Hide Losses Better Than Other Lines

Draught hides losses in cellar temperature, line cleaning waste, and poor dispense calibration. Cask and keg volumes are measurable with a dip stick and you get immediate feedback if something’s wrong. But spirits—especially when served by optic or free-pour—are silent. A customer doesn’t notice if their double is 45ml instead of 50ml. Your till records it as one unit sold. But your bottle count is short.

That’s why the number that actually matters is wet GP by line, not a single headline stock figure. You need to know your spirit margin separately from your draught and wine. If your draught GP is healthy but your spirits are weak, you know where to focus. Most pubs never calculate this because it requires discipline: weekly spirit measurement, till reconciliation on the same day, and a simple spreadsheet or system to track the variance.

Record-Keeping and Compliance

The Weights and Measures Act 1985 doesn’t require you to keep written records of every measure poured (that would be impractical). But it does require you to be able to demonstrate that you’re operating within the law. In practice, this means:

• Having calibrated measures (optics, jigging tools, or scales) available for inspection.
• Keeping records of when measures were last tested or calibrated (this is voluntary but looks good in an enforcement visit).
• Being able to explain how you ensure staff are using the correct measure consistently.
• Having till records that match your stock counts at regular intervals (weekly is ideal, monthly is acceptable, but any longer is risky).

From a compliance perspective, weekly stock records also protect you in another way: they create an audit trail. If a customer disputes a price, or if your licence is queried, you can demonstrate that you were trading responsibly and knew your stock position. This matters more than most licensees realise.

The most underrated compliance tool is a simple weekly count log—a record showing the date, the line (e.g., Gordon’s Gin), the opening stock, the till sales, the closing stock, and the variance. If that variance is consistently less than 2%, you’re in control. If it’s creeping up, you can act. And if an enforcement officer asks to see it, you’ve got proof that you’re managing your business properly.

Common Breaches and How to Avoid Them

In 15 years running a Marston’s pub, I’ve seen most of the common breaches—both in my own early days and in conversations with other licensees. Here’s how to sidestep them:

Breach 1: Using Non-Standard Measures

This includes 20ml measures (some budget optics default to this), free-pouring without any control, or using a measure that’s worn, damaged, or uncalibrated. The fix is simple: audit your bar equipment. Check every optic. If it’s not marked 25ml, 35ml, or 50ml, replace it. Budget optics cost £2–£5. A licensing breach costs £hundreds in fines and time.

Breach 2: No Displayed Pricing or Measure Size

This is the most common enforcement finding. The solution is a printed price list at the bar, a till screen that shows the measure, or a menu board. It takes an afternoon to set up and zero pounds to fix if you do it yourself.

Breach 3: Inconsistent Staff Practice

Your bar staff aren’t deliberately free-pouring; they’re just not trained on the measure. A 10-minute toolbox talk at the start of each shift—”We use 25ml, it’s on the optic, if the customer asks for a double it’s two measures”—prevents 80% of inconsistency. Newer staff especially need this. Most pubs don’t do it, which is why variance creeps in.

Breach 4: Till Records That Don’t Match Physical Stock

If your till says you sold 100 units of vodka but you’ve only lost 25ml from the bottle, you’ve got a problem. The fix is daily or weekly reconciliation. Spot-check your till count against your bottle count once a week. Discrepancies of more than 3% warrant investigation. Anything regular is a training or control issue.

The reality is that most breaches aren’t prosecuted—they’re resolved informally. But they go on file. A second breach at the same pub within 18 months escalates. And a pattern of breaches can affect your renewal. It’s far cheaper to get ahead of this than to manage it reactive.

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