Click place name to go to the list of private investigators operating in that area.
- Caerphilly
- Camberley
- Camborne
- Cambridge
- Cambridgeshire
- Cannock
- Canterbury
- Canvey Island
- Cardiff
- Carlisle
- Castleford
- Central London
- Central Manchester
- Chatham
- Chelmsford
- Cheltenham
- Chesham
- Cheshire
- Cheshunt
- Chester
- Chesterfield
- Chichester
- Chippenham
- Chorley
- Christchurch
- Clacton-on-Sea
- Cleethorpes
- Clevedon
- Coalville
- Colchester
- Colwyn Bay
- Congleton
- Consett
- Corby
- Cornwall
- Cornwall, East
- Cornwall, Mid
- Cornwall, West
- Corringham
- Coventry
- Crawley
- Crewe
- Crowthorne
- Croydon
- Cumbernauld
- Cumbria
- Cumbria, North
- Cumbria, South