Doug Roy Tidswell

THDA Ltd. provides structural and civil engineering consulting services. It specializes in the infrastructure design for development schemes such as highways, roads, earthworks modelling and flood risk assessments. The company was founded in 2003 and is headquartered in Birmingham, the United Kingdom.

PPCE Group Ltd, formerly known as Patrick Parsons, is an engineering consultancy firm that has been providing exceptional engineering solutions for over 50 years. The company is based in Weybridge, UK. The British company's infrastructure engineers can assist with anything from a simple bellmouth access or soakway design, right the way up to the design of motorway or trunk road standard highway works. The company's experienced structural engineering design teams deliver on projects across the residential to commercial schemes. PPCE Group offers services in Civil, Structural & Geo-Environmental Engineering and a comprehensive planning service. The CEO of the company is Gail Bamforth.