1. British Geological Survey, Cardiff University Main Building, Park Place, Cardiff CF10 3AT, UK
2. British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
3. Public Health Wales, 2 Capital Quarter, Tyndall Street, Cardiff CF10 4BZ, UK
4. Natural Resources Wales, Ty Cambria, 29 Newport Road, Cardiff CF24 OTP, UK
5. Powys County Council, Powys County Hall, Spa Road East, Llandrindod Wells LD1 5LG, UK