| Name | Country | Region | |
| The Paul Elliott Consultancy (CI) Ltd | British Channel Islands | Guernsey | St. Saviour |
| The Due Diligence and Investigation Company Ltd | British Channel Islands | Jersey | St Helier |
| Dtect Solutions | Gibraltar | Gibraltar | Gibraltar |
| Proficient Surveyors and Co | Hong Kong | Shaukeiwan | 324 Shaukeiwan Rload |
| Apt Security Consultancy Ltd | Nigeria | Lagos | Agege |
| Rise For Justice | Pakistan | Islamabad | PWD Society |
| Walker Love | UK | Aberdeenshire | Aberdeen |
| Walker Love | UK | Ayrshire | Kilmarnock |
| Southern Law Services | UK | Berkshire | Reading |
| Paul Read Investigations Ltd | UK | BERKSHIRE | READING |
| T/A Wilf Hurrell Investigations | UK | Cambridgeshire | Burwell |
| Blayze Ltd | UK | Cambridgeshire | Peterborough |
| Amsel & Co | UK | Cheshire | Altrincham |
| Walker Love | UK | Dunbartonshire | Dumbarton |
| Enquire International Limited | UK | East Sussex | Gatwick |
| Austin-Allen | UK | East Sussex | Heathfield |
| Aitch-Gee Investigation Ltd | UK | Essex | Brentwood |
| Eccora Ltd | UK | Greater London | London |
| The Risk Advisory Group plc | UK | Greater London | London |
| Central Investigation Bureau Limited | UK | Hamsphire | Portsmouth |
| C.SIAPPS Associates | UK | Hertfordshire | Hertford |
| WM Investigation Ltd | UK | Hertfordshire | Hemel Hempstead |
| P&D Investigations Limited | UK | Hertfordshire | Welwyn Garden City |
| Walker Love | UK | Invernessshire | Inverness |
| Research Associates (Paul Hawkes) | UK | London | North Kensington |
| A E D Global | UK | London | London |
| Research Associates (Paul Hawkes) | UK | London | Marylebone |
| Research Associates (Paul Hawkes) | UK | London | Notting Hill Gate |
| Walker Love | UK | Midlothian | Edinburgh |
| Grant & McMurtrie | UK | Midlothian | Edinburgh |
| Pegasus Investigations Ltd | UK | Midlothian | Edinburgh |
| Mr Andrew | UK | Midlothian | Edinburgh |
| Mr Beare | UK | Oxfordshire | Oxford |
| J P V Investigations | UK | Oxfordshire | Carterton |
| Enquire International Limited | UK | Perthshire | Killin |
| Walker Love | UK | Renfrewshire | Paisley |
| A D Duncan Investigations & Precognitions | UK | Shetland Islands | Scalloway, Lerwick |
| Independant Investigation Co | UK | Somerset | Somerton |
| Grant & McMurtrie | UK | Strathclyde | Glasgow |
| Walker Love | UK | Strathclyde | Glasgow |
| Hogan and Co. International | UK | Surrey | Farnham |
| De Facto International | UK | Surrey | Twickenham |
| Blayze Ltd | UK | Swansea | Swansea |
| Blayze Ltd | UK | West Glamorgan | Swansea |
| M C McNeill and Co | UK | West Lothian | Bathgate |
| Blayze Ltd | UK | Wiltshire | Swindon |
| Sure Step Investigations | United Kingdom | Gwent | Monmouth |
| Bluelight Investigations | Zimbabwe | Harare | Mount Pleasant |