Gateley, which is listed on the London Stock Exchange (GTLY), said its IT team detected a breach from a “now known external source.” The firm took some systems offline after the intrusion was discovered, but said it quickly restored core systems.

Based on the information collected by the company to date, it believes the impact of the incident was limited and the attackers only managed to access roughly 0.2% of its data.

Gateley admitted that the compromised data included some client information and the firm said it will notify impacted customers. Law enforcement and relevant regulators, including the Information Commissioner’s Office (ICO), have been notified.