Certifications such as ISO standards play an important role in strengthening the effectiveness of our sustainability strategy. They provide an externally recognised benchmark for how we manage key operational, environmental and social risks, and demonstrate that our practices meet established international best‑practice requirements. ISO‑aligned systems help us embed strong processes across the Group, improving the quality of our controls and driving continuous improvement.
We also obtain independent limited assurance over our data and disclosures relating to greenhouse gas emissions. The relevant statements are included on this page.
Our Sustainability Performance
We voluntarily report to many of the leading independent ESG rating providers, who in turn provide a score based on factors such as risk exposure, resilience, controversies and performance in relation to sustainability topics. We are proud to be a sector leader amongst many leading ESG rating providers — the following table shows our performance over time:
ISO Certification
- ISO 14001:2015: Environmental Management System standard
- ISO/IEC 27001:2022 Information Security Management System
- ISO 45001:2018 Occupational Health & Safety Management System standard
Assurance Statements
- Bureau Veritas Assurance Report 2024
- Carbon Trust Assurance Statement 2023
- Carbon Trust Verification Report 2023
- Carbon Trust Assurance Statement 2022
- Carbon Trust Assurance Statement (2022 Data)
- Carbon Trust Verification Report 2022
Basis of Reporting
Sustainability Policies