| Reference Number | Full Name | Occupation | Disciplines | Company | Audit Expiry Date | Status |
|---|---|---|---|---|---|---|
| 0759 | Daniel Ashton | Lead Driller | RTY | W J Groundwater | 2024-11-26 | Audited |
| 0988 | Daniel Closs | Lead Driller | RTY | Natural Power | 2025-03-06 | Audited |
| 0859 | Daniel Cundill | Lead Driller | CP | Soil Engineering Geoservices | 2024-12-12 | Audited |
| 0991 | Danny Davis | Lead Driller | RTY | Marshall Drilling | 2025-04-10 | Audited |
| 0993 | Danny Williams | Lead Driller | RTY | CC Ground Investigations | 2025-05-13 | Audited |
| 834 | Darren Jones | Lead Driller | RTY | Geotechnical Engineering Ltd | 2024-07-25 | Audit Expired |
| 0895 | David Bailey | Lead Driller | SON | GeoSonic Drilling | 2024-05-29 | Audit Expired |
| 0644 | David Dodd | Lead Driller | RTY | Socotec UK Ltd | 2024-08-15 | Audited |
| 0953 | David Grey | Lead Driller | CP | Strata Geotechnics | 2024-12-11 | Audited |
| 0852 | David Minett | Lead Driller | RTY | Geotechnical Engineering Ltd | 2024-09-11 | Audited |
| 0528 | David Nayles | Lead Driller | RTY | BAM Ritchies | 2025-04-03 | Audited |
| 081 | David Papworth | Lead Driller | RTY | Socotec UK Ltd | 2024-08-09 | Audited |
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