| Name | Country | Region | |
| The Paul Elliott Consultancy (CI) Ltd | British Channel Islands | Guernsey | St. Saviour |
| GPG, Stockholm | Sweden | - | Stockholm |
| GPG, Malmo | Sweden | - | Malmo |
| GPG, Gothenburg | Sweden | Gothenburg | Landvetter Airport |
| Meelis & Partners Forensics and Investigation BV | The Netherlands | AMSTERDAM area | 1967 DB Heemskerk |
| James Reid & Son | UK | Aberdeenshire | Aberdeen |
| Walker Love | UK | Argyll | Oban |
| Walker Love | UK | Ayrshire | Kilmarnock |
| Cambridge Detective Agency Ltd | UK | Cambridgeshire | Cambridge |
| D.Nightingale Vehicle Consultant | UK | Cambridgeshire | March |
| Counter Crime Limited | UK | Cambridgeshire | Huntingdon |
| Blayze Ltd | UK | Carmarthenshire | Ammanford |
| Susan Ward Investigations | UK | Derby | Oakwood |
| Walker Love | UK | Dunbartonshire | Dumbarton |
| Richard Arthur Lee Consulting Ltd | UK | Essex | Chelmsford |
| Gwent Legal Services | UK | Gwent | Newport |
| Central Investigation Bureau Limited | UK | Hamsphire | Portsmouth |
| P&D Investigations Limited | UK | Hertfordshire | Welwyn Garden City |
| Cobra Investigation Consultants | UK | Kent | Birchington |
| Walker Love | UK | Lanarkshire | Hamilton |
| RTA Investigations | UK | Lancashire | Rochdale |
| Castle Investigations | UK | Lancashire | Blackpool |
| Research Associates (Paul Hawkes) | UK | London | Marylebone |
| Research Associates (Paul Hawkes) | UK | London | Notting Hill Gate |
| Walker Love | UK | Midlothian | Edinburgh |
| Mendes (Investigation Services) Ltd | UK | North Lincolnshire | Scunthorpe |
| Walker Love | UK | Strathclyde | Glasgow |
| Boothroyds | UK | Strathclyde | Glasgow |
| Cambridge Detective Agency Ltd | UK | Suffolk | Newmarket |
| Blayze Ltd | UK | West Glamorgan | Swansea |
| Blayze Ltd | UK | West Midlands | Birmingham |
| Blayze Ltd | UK | Wiltshire | Swindon |
| JJ Ashe Ltd | United Kingdom | East Sussex | Posingford |