CRDS Ltd. (Cultural Resource Development Services Limited) is an independent professional consulting company, which has been providing a high level of service since 1997 to a wide range of clients, including the NRA, the RPA, National Monuments, County Councils and private sector developers.  Services include all levels of archaeological survey and assessment, from environmental impact studies to full excavation.  Specialist areas of expertise within the company include:  medieval architecture, architectural survey and recording, GPS/EDM surveying, geophysical investigations, underwater archaeology, and geology.