Teesside the four independent unitary authority boroughs of Hartlepool, Stockton, Middlesbrough and Redcar and Cleveland (a renamed Langbaurgh). At this time they were returned to the counties of North Yorkshire and County Durham for ceremonial purposes, with Stockton-on-Tees becoming the only district in England split between two ceremonial counties. In 1998 the neighbouring Borough of Darlington also became an independent unitary authority and this along with the four former Cleveland boroughs form the sub-region of the Tees Valley which is used for statistical purposes and governmental organisation. The name Tees Valley is increasingly promoted for economic and cultural connections, though Teesside,
Teesside Refinery On site there is a canteen, an active sports and social club and People SPIRIT team who organise a variety of activities. When owned by ConocoPhillips they continually funded technical apprenticeship schemes in the area, and were directly involved in local primary and secondary school education. Initiatives ranged from donating computers and funding school exchange programmes, to providing engineers for maths and science days. The Teesside terminal is accredited (certified) to ISO 14001, the international environmental management system standard, which it has held continuously since October 1998. The site is on the fringe of the estuary mudflats of Seal Sands,