Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,151 pages of information and 233,681 images on early companies, their products and the people who designed and built them.
Marples Ridgway was a British civil engineering company
1956 Allt na Lairige Dam, Argyllshire
1959 Chiswick Flyover
1961 Hammersmith Flyover
1968 Planned to extend its activities from civil engineering (with its somewhat lumpy contracts) to general building
1969 Bath and Portland integrated its building and civil engineering activities, forming 2 new subsidiaries: Marples Ridgway would be the new subsidiary carrying out all civil engineering work; Marples Ridgway (Building) would be the subsidiary controlling all building activities; Dudley Coles Long would be a subsidiary of Marples Ridgway (Building) 
Pulled out of a roads contract in Iran
Built the Hong Kong metro system.
1983 Bath and Portland disposed of the civil engineering interests, Marples Ridgway, which were not making much profit in view of the size of the turnover of these businesses; they were acquired by a Jersey-based subsidiary of the Dutch contractor, LTA.. Dudley Coles Long remained a subsidiary of Bath and Portland.