UK Car Insurance Groups Explained: Bands 1 to 50 & How to Lower Your Premium
Direct Answer: In the UK, car insurance groups are a standardised risk rating system spanning from Group 1 (cheapest to insure) to Group 50 (most expensive). Administered by Thatcham Research on behalf of the Association of British Insurers (ABI) Group Rating Panel, vehicles are assigned a band based on repair costs and parts pricing, repair times, new vehicle value, engine performance and acceleration, and active safety systems like Autonomous Emergency Braking (AEB).
When shopping for a new or used vehicle in the United Kingdom, few factors influence your annual motoring overheads as dramatically as your vehicle's insurance group rating. Check our guides on PCP vs HP car finance and UK road tax VED bands to calculate your full vehicle running costs.
How the UK 1–50 Car Insurance Group System Works
Every passenger car officially sold in the UK market is evaluated by the Group Rating Panel, which meets monthly and includes representatives from the Association of British Insurers (ABI) and Lloyd's Market Association (LMA).
The testing and data analysis are conducted independently by Thatcham Research, the automotive risk intelligence centre funded by the insurance sector.
| Group Band | Market Segment | Typical Vehicles | Underwriting Risk Profile |
|---|---|---|---|
| Group 1 to 10 | City cars & entry hatchbacks | VW Up!, Skoda Citigo, Fiat 500 1.2, Kia Picanto | Lowest risk; modest engines, low repair parts cost |
| Group 11 to 25 | Family hatchbacks & compact crossovers | Ford Focus 1.0, VW Golf 1.5 TSI, Nissan Qashqai | Average risk; balanced performance and safety |
| Group 26 to 40 | Executive saloons & hot hatchbacks | BMW 3 Series, Audi A4, Golf R, Tesla Model 3 | Higher risk; increased top speed, expensive panels |
| Group 41 to 50 | Luxury flagships, sports cars & supercars | Porsche 911, Range Rover Sport, Audi RS6 | Maximum risk; specialised parts, high theft attractiveness |
The 5 Core Criteria: How Thatcham Evaluates Every Car
To assign an insurance group from 1 to 50, Thatcham Research inspects over 100 individual engineering and safety data points across five key categories:
1. Cost of Replacement Parts and Damageability
Thatcham calculates the total cost of a standard basket of 23 common replacement parts (bumpers, headlamps, windscreens, radiators, wings). Cars with cheap, readily accessible parts achieve significantly lower group ratings.
2. Repair Times and Structural Complexity
How long does a bodyshop take to repair standard crash damage? Complex aluminium chassis, specialised carbon fibre panels, and labour-intensive structural welds increase repair hours and push a vehicle into a higher group.
3. New Vehicle Price and Market Value
The recommended retail price (RRP) of the vehicle when new serves as a baseline for the insurer’s financial exposure in the event of a total write-off or theft claim.
4. Engine Performance, Top Speed & Acceleration
Vehicle performance data—specifically 0–62 mph acceleration times, brake horsepower (bhp), and top speed—is heavily weighted. Statistically, faster cars are involved in higher-energy collisions resulting in costlier third-party claims.
5. Active Safety & Bumper Alignment
Vehicles fitted with standard-fit Autonomous Emergency Braking (AEB), radar-assisted collision mitigation, and properly aligned bumper beams receive substantial group reductions.
Security Suffix Letters: What A, D, E, U, G, and P Mean
When checking a vehicle’s group rating, you will often see a letter suffix attached to the number (such as Group 12E or Group 24A). These indicate compliance with Thatcham’s anti-theft benchmarks:
| Security Suffix | Full Meaning | Impact on Insurance Premium |
|---|---|---|
| E (Exceeds) | Exceeds security requirements for its class | Positive: Eligible for a reduced group rating (e.g. Group 15 reduced to 14E). |
| A (Acceptable) | Meets standard security requirements for its class | Neutral: Group rating remains standard. |
| T (Thatcham Listed) | Fitted with recognised Thatcham security device | Neutral/Positive: Meets benchmark alarm/immobiliser standards. |
| D (Deficient) | Does not meet security benchmarks for its class | Negative: Group rating may be bumped up (e.g. Group 18 increased to 19D). |
| U (Unacceptable) | Security level is significantly below minimum standards | Negative: Insurers may require an aftermarket alarm before providing cover. |
| P (Provisional) | Interim rating applied when testing data is incomplete | Temporary: Replaced once full crash tests conclude. |
| G (Grey Import) | Imported vehicle not originally built for UK market | Specialist: Rated on an individual bespoke basis. |
What Is Group 1 Insurance? The Cheapest Cars to Insure in the UK
Group 1 is the absolute lowest insurance category in the United Kingdom. Cars in this band feature small, economical 1.0-litre engines, modest power outputs (usually under 75 bhp), inexpensive replacement bodywork, and standard electronic immobilisers.
| Make & Model | Engine Spec | Insurance Group | Why It Qualifies for Group 1 |
|---|---|---|---|
| Volkswagen up! | 1.0L MPI (60 PS) Take Up / Move Up | Group 1E | Exceptional AEB city braking, cheap modular bumper clips |
| Skoda Citigo | 1.0L MPI (60 PS) S / SE | Group 1E | Shared VW Group platform, low top speed, economical parts |
| SEAT Mii | 1.0L (60 PS) Ecomotive | Group 1E | Lightweight city chassis, low repair duration |
| Hyundai i10 | 1.0L MPi Classic / S (Pre-2020) | Group 1E | 5-year warranty standards, inexpensive body panels |
| Kia Picanto | 1.0L '1' Spec | Group 1E | Standard electronic immobiliser, low engine output |
| Ford Fiesta | 1.1L Ti-VCT (70 PS) Trend / Style | Group 2E – 4E | Slightly higher group, but cheap parts availability nationwide |
The New Vehicle Risk Rating (VRR) System (1–99 Scale)
While the 1–50 system remains the standard for all existing vehicles on UK roads, Thatcham Research and the ABI introduced the Vehicle Risk Rating (VRR) system for all new vehicle models launched from 1 August 2024 onwards.
Instead of a single blended number, VRR scores cars across five independent pillars on a 1 to 99 scale:
- Performance: Power, torque, acceleration, and top speed.
- Damageability: How susceptible the vehicle is to damage in low-to-medium speed impacts.
- Repairability: Accessibility of replacement parts, availability of qualified technicians, and calibration of ADAS cameras.
- Safety: Crash test performance and active driver assistance systems.
- Security: Resistance to digital relay theft and keyless hacking.
6 Proven Ways to Lower Your Car Insurance Premium
While a lower insurance group provides the best head start, UK insurers also price risk based on driver profile and policy terms. Follow these six steps to minimise your annual premium:
- Increase Your Voluntary Excess: Agreeing to a higher voluntary excess (e.g. £250 to £500) alongside compulsory excess demonstrates you will absorb minor scratches, substantially lowering the insurer’s quote.
- Add an Experienced Named Driver: Adding a parent, spouse, or older relative with a clean driving record as a secondary named driver can lower risk algorithms (never commit "fronting" by listing them as the main driver).
- Install a Telematics (Black Box) Device: Young drivers can save 30% to 50% with a black-box policy tracking speed, braking smoothness, and nighttime driving.
- Pay Annually Instead of Monthly Direct Debit: Paying monthly is effectively a credit agreement with APRs often exceeding 20% to 30%. Paying upfront saves £100+ instantly.
- Accurately Estimate Annual Mileage: Overestimating your annual mileage (e.g. declaring 12,000 miles when you drive 6,000) artificially inflates your road risk.
- Park in a Secure Garage or Driveway: Vehicles parked off-road in private driveways or locked garages are less prone to vandalism and theft.
Frequently Asked Questions
What are car insurance groups in the UK?
Car insurance groups are a 1 to 50 rating scale administered by Thatcham Research and the Association of British Insurers (ABI) that categorises every UK car based on repair costs, performance, security, and safety risk.
Is car insurance group 1 the cheapest?
Yes, Group 1 is the cheapest insurance group in the UK. Cars in Group 1 have small engines, inexpensive repair parts, high security ratings, and low acceleration, resulting in the lowest insurance premiums.
How do I check what insurance group my car is in?
You can look up your vehicle's insurance group by entering your registration number into online insurance comparison tools, Thatcham Research’s vehicle database, or the Parkers/RAC vehicle checker.
Who sets UK car insurance groups?
Insurance groups are recommended by the Group Rating Panel, which is managed by Thatcham Research alongside representatives from the Association of British Insurers (ABI) and Lloyd's Market Association.
Does a car insurance group guarantee my premium price?
No. Insurance groups are advisory recommendations used by underwriters. Your final premium also depends on your age, driving record, postcode, annual mileage, claims history, and occupation.
What do the letters after insurance groups mean (like 12E or 20A)?
The letters represent the vehicle's security rating: E means Exceeds security standards (lowering the group), A means Acceptable, D means Deficient (increasing the group), U means Unacceptable, and P means Provisional.
What is the difference between the 1–50 group system and the new Vehicle Risk Rating (VRR)?
The traditional 1–50 system assigns a single blended group score. The new Vehicle Risk Rating (VRR) system, launched in August 2024 for new models, uses a 1–99 scale evaluated across five independent pillars (Performance, Damageability, Repairability, Safety, Security).
Can an electric car be in a low insurance group?
Yes, smaller electric cars like the Renault Zoe or Nissan Leaf sit in moderate groups (Groups 14–22). However, high-performance EVs like the Tesla Model 3 Performance or Porsche Taycan occupy Group 48 to 50 due to rapid acceleration and specialised battery repair costs.
Why does a car's insurance group change between trim levels?
Different trim levels of the same model often feature different engines, larger alloy wheels, upgraded infotainment screens, or turbocharged outputs. For example, a base Ford Fiesta might be Group 3, while a Fiesta ST is Group 28.
Does fitting an approved dash cam lower my insurance group?
Fitting a dash cam does not change the vehicle's official 1–50 Thatcham insurance group rating, but many individual insurance companies offer direct premium discounts (typically 10% to 15%) for drivers with working dash cams.