The UK government has imposed a visa brake on nationals of 4 countries following widespread abuse of immigration rules. A visa brake is a temporary suspension of visa issuance to nationals of a specific country, typically triggered by high rates of document fraud, overstaying, or other serious violations of immigration law.
During a brake, nationals of the affected countries cannot apply for UK visas—including student, work, family, and visitor visas—until the suspension is lifted. The brake remains in place until the UK Home Office determines that the country has taken sufficient steps to address the underlying issues.