| Reference Number | Full Name | Occupation | Disciplines | Company | Audit Expiry Date | Status |
|---|---|---|---|---|---|---|
| 0839 | Dilwyn Roberts | Lead Driller | RTY | GeoSonic Drilling | 2025-07-10 | Audited |
| 0737 | Donald Brown | Lead Driller | RTY | Raeburn Drilling & Geotechnical T/A Igne | 2025-08-07 | Audited |
| 1023 | Duncan Lamb | Lead Driller | CP | Structural Soils | 2025-11-13 | Audited |
| 911 | Gary Blake | Lead Driller | RTY | Structural Soils | 2026-01-28 | Audited |
| 0936 | Gavin Williamson | Lead Driller | RTY | ACE Drilling Services | 2025-11-18 | Audited |
| 1030 | Glen Chinnery | Lead Driller | CP | Endeavour Drilling | 2026-01-21 | Audited |
| 1048 | Glenn Kenny | Lead Driller | RTY | Arcadis UK | 2026-03-03 | Audited |
| 0794 | Graham Torrens | Lead Driller | RTY | Causeway Geotech Ltd | 2025-11-07 | Audited |
| 1061 | Harry Bateman | Lead Driller | RTY | Kensa Group | 2026-03-05 | Audited |
| 0717 | Henry (Harry) Glover | Lead Driller | RTY | CC Ground Investigations | 2026-02-19 | Audited |
| 0648 | Ian John Wilson | Support Operative | BAM Ritchies | 2026-08-21 | Audited | |
| 0771 | Ian Slater | Lead Driller | CP, SON | BAM Ritchies | 2026-02-09 | Audited |
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