Worst Banks UK 2026
The banks with the highest complaint rates in 2026, ranked using official UK regulator data. Complaint rates are calculated per 1,000 accounts so you can compare fairly regardless of company size. How we calculate this →
| # | Company | Rate (per 1,000 accounts) ↕ | Total Complaints ↕ | Ombudsman Uphold ↕ |
|---|---|---|---|---|
| 1 | James Hay | 282.1 | 2,194 | — |
| 2 | Wesleyan | 154.2 | 1,537 | — |
| 3 | Swift 1st | 137.3 | 1,712 | — |
| 4 | Elderbridge | 45.4 | 1,549 | — |
| 5 | Aldermore | 42.5 | 4,569 | — |
| 6 | Landmark Mortgages | 37.7 | 1,249 | — |
| 7 | Pepper Money | 31.3 | 1,301 | — |
| 8 | Marshmallow | 26.6 | 11,357 | — |
| 9 | Nutmeg | 25.4 | 2,238 | — |
| 10 | USAY Group | 22.8 | 1,403 | — |
Ombudsman uphold rate shows the percentage of escalated complaints decided in the customer's favour. Higher = more justified complaints. Source: Financial Ombudsman.
What Can You Do?
If your bank appears on this list, you have options. Switching banks in the UK is straightforward and you can often move to a better provider within days.
- Check your current provider's scorecard for full complaint details
- Compare against the sector average to understand how bad the problem is
- If you've had a complaint ignored, escalate to the relevant Ombudsman — it's free
- Use comparison sites to find providers with lower complaint rates
Frequently Asked Questions
Where does the banks complaint data come from?
All data comes from official UK regulators — the FCA (banks and insurers), Ofgem (energy suppliers), and Ofcom (broadband providers). These bodies require companies to publish complaint statistics at regular intervals. We process their public datasets and calculate complaint rates to enable fair comparisons.
What does complaint rate mean?
Complaint rate is the number of complaints per per 1,000 accounts. This normalises for company size — a large company with millions of customers will naturally receive more total complaints than a small one. By using a rate, you can compare fairly across companies of different sizes.
How often is this data updated?
Regulator data is published quarterly or twice yearly depending on the sector. We update our rankings whenever new official data is released. Each company page shows the period covered by the data.
Does a high complaint rate mean a company is bad?
A high complaint rate is a significant red flag, but context matters. Some companies serve higher-risk customer segments or product types that attract more disputes. We recommend also checking the Ombudsman uphold rate — this shows how often customers who escalate complaints actually win their case, which is a strong indicator of whether complaints are justified.
Data sourced from official UK regulators. Rankings updated when new regulator data is published. Individual company scores may differ from overall sector rankings due to product mix and customer base. Full methodology →