Four New Driving Rules and Changes Coming in September: What UK Motorists Need to Know

September has a habit of sneaking up on drivers. The nights start drawing in, the summer holiday traffic clears, and quietly, in the background, a whole raft of motoring rules resets. This year is no exception. From the pence-per-mile rates that determine what your employer owes you for business fuel, to fresh charges on two of London's busiest river crossings, and changes that could affect how disabled drivers access their vehicles, September 2025 brings a cluster of updates that are easy to miss but expensive to ignore.

Let's unpack what's actually changing, why it matters, and what you should be doing about it before the month is out.

What's Happening This September

According to reporting from Birmingham Live, four significant changes are landing this month: a revision to HMRC's advisory fuel rates, new charging arrangements affecting the Blackwall and Silvertown Tunnels, updates to the Motability scheme, and changes tied to vehicle registration.

On the surface, these might look like a random grab-bag of bureaucratic tweaks. Dig a little deeper, though, and each one has a direct financial or practical consequence for a specific group of drivers, whether that's company car users, London commuters, disabled motorists, or anyone buying a brand new car this month.

Advisory Fuel Rates: The Quiet Quarterly Reset

HMRC updates its advisory fuel rates (AFRs) four times a year, on 1 March, 1 June, 1 September and 1 December. These rates matter enormously if you drive a company car. They set the pence-per-mile figure that employers use to reimburse staff for fuel used on business trips, and they're also used to work out how much employees should repay their employer for private mileage in a company car without triggering a taxable benefit.

The rates are broken down by engine size and fuel type (petrol, diesel and LPG), and there's a separate rate for fully electric company cars, known as the Advisory Electricity Rate. Because fuel and energy prices fluctuate throughout the year, these figures move too, sometimes up, sometimes down.

If you drive a company car and claim mileage, this September's revision could mean either a small pay rise or a small pay cut, depending on how prices have shifted. The key point is that these rates are the HMRC-approved benchmark. Reimbursements made at or below the advisory rate don't need to be reported to HMRC and won't be taxed as a benefit in kind, but paying more without proper justification could create a tax liability for the employee.

Blackwall and Silvertown Tunnels: Charges on the Move

London's river crossings continue to be a source of friction for drivers east of the city centre. The Silvertown Tunnel opened relatively recently, and it runs alongside the much older Blackwall Tunnel with a shared charging scheme designed to manage congestion between the two.

September brings a change to how much drivers pay to use these crossings. Given how frequently these charges are already catching drivers off guard, particularly those unfamiliar with the automatic number plate recognition system used to enforce payment, it's worth checking the latest fee structure before you travel. We've covered the detail of what's changing and how to avoid an unexpected penalty charge notice in our dedicated piece on the Blackwall and Silvertown Tunnel charge rise, so if you regularly use either crossing, that's essential reading.

Motability Scheme Updates

The Motability scheme, which allows disabled people to lease a car, scooter or powered wheelchair using their mobility allowance, sits at the intersection of transport policy and welfare policy. That makes it particularly sensitive to wider government decisions about disability benefits.

Any adjustment to eligibility criteria, payment structures, or the terms attached to leased vehicles has knock-on effects for hundreds of thousands of disabled drivers and their families who rely on the scheme for independence. Given the ongoing national conversation around reform of Personal Independence Payment (PIP) and other disability benefits, changes affecting Motability this September deserve close attention from anyone currently in the scheme or considering applying.

If you're a Motability user, the safest course of action is to check directly with Motability or your assessment provider rather than relying on general news summaries, because eligibility rules can be nuanced and individual circumstances vary significantly.

Vehicle Registration Changes

September is one of two months each year, alongside March, when the DVLA introduces a new age identifier on number plates. This twice-yearly change is why the used car market sees such a spike in trade-in activity in late summer, as owners look to move on their current vehicle before the new plates make it look "older" by comparison, even though nothing about the car itself has changed.

For anyone buying new this month, it's worth understanding how the identifier works and what it means for resale value down the line. It's also a good moment to double-check your own vehicle's registration details are accurate and up to date with the DVLA, since errors on record can cause real headaches later, including DVLA fines related to unpaid vehicle tax or incorrect records.

Why It Matters: The Bigger Picture

None of these four changes exists in isolation. Together, they illustrate something drivers are increasingly having to grapple with: motoring costs and rules in the UK are no longer set once a year in a Budget speech. They shift constantly, through quarterly HMRC updates, local authority charging schemes, welfare policy tweaks, and administrative registration cycles.

This drip-feed approach to change has a real cost. Drivers who aren't actively checking for updates can end up out of pocket, whether through under-claimed business mileage, an unexpected tunnel charge, a lapsed Motability entitlement, or confusion at the point of sale when buying a car. For company car drivers specifically, getting the advisory fuel rate wrong, even innocently, can create unwanted tax complications that take time and paperwork to unwind with HMRC.

There's also a broader context worth noting. Fuel costs, congestion charging, and welfare-linked transport support are all politically live issues at the moment. The government has been under pressure over fuel duty, over the pace of low emission zone rollouts, and over the sustainability of disability benefits. Motoring changes announced in September, even administrative ones, often sit within that wider debate about who pays what to keep driving in the UK, and who gets support to do so.

The Legal and Regulatory Angle

It's worth being clear about what these changes are, and aren't, from a legal standpoint.

The advisory fuel rates are HMRC guidance rather than statute, but they carry real weight because they determine tax treatment under the benefit-in-kind rules set out in the Income Tax (Earnings and Pensions) Act 2003. Employers who reimburse at rates significantly above the advisory figure without solid justification risk having the excess treated as a taxable benefit.

Tunnel and river crossing charges, meanwhile, are typically enforced under local traffic management schemes, with non-payment resulting in a penalty charge notice rather than a criminal offence. As with any PCN, drivers do have a right to challenge charges they believe were issued incorrectly, whether due to a signage failure, a technical fault, or a genuine payment that wasn't properly logged.

Motability eligibility is tied to entitlement under PIP, Disability Living Allowance, Adult Disability Payment or War Pensioners' Mobility Supplement, meaning any change to those underlying benefits can directly affect who qualifies for a Motability vehicle. This is a matter of social security law as much as motoring law, and anyone concerned about their eligibility should seek guidance from Motability directly or from a welfare rights adviser rather than assuming general news coverage applies to their specific case.

Vehicle registration itself is governed by DVLA rules under the Vehicle Excise and Registration Act 1994, and keeping your details accurate isn't just good practice, it's a legal requirement.

What Drivers Should Do Now

A few practical steps make sense this month:

• Company car drivers and employers should check the new HMRC advisory fuel rates as soon as they're published and update mileage claim processes accordingly, rather than continuing to use last quarter's figures by default.
• Anyone crossing the Thames via Blackwall or Silvertown should confirm the current charge before travelling, and set up an account with the operator if you use the crossings regularly to avoid missed payments turning into penalty notices.
• Motability scheme users should keep a close eye on official communications about their benefit and lease terms, and flag any concerns early rather than waiting for a renewal date to arrive.
• Anyone buying a car this September should factor the new plate identifier into negotiations, particularly on trade-in value, and take the opportunity to verify their registration and tax status with the DVLA while they're at it.

Looking Ahead

September's changes are a reminder that motoring costs in the UK are managed through a constant series of small, technical adjustments rather than one big annual reset. Individually, none of these four changes will make headline news for long. Collectively, they add up to real money and real complications for drivers who aren't paying attention.

Expect this pattern to continue. With ongoing pressure on public finances, live debates about disability benefit reform, and London's charging infrastructure still bedding in around the Silvertown Tunnel, further tweaks are likely before the year is out. The sensible approach is the same one that applies to most areas of motoring law: check official sources regularly, don't assume last quarter's rules still apply, and act quickly if something looks like it might catch you out. A few minutes spent checking a rate or a registration detail this September could save considerable hassle, and money, later in the year.