Teesside Park growth was originally the Teesside Development Corporation in the late 1980s when the two current unitary authorities were part of the county of Cleveland. The park's location is often incorrectly listed as Stockton-on-Tees (for the leisure park), Teesside, Cleveland or Middlesbrough (for the retail park). It is built on the former site of Stockton Racecourse, hence many of the park's roads being named after famous racecourses such as Aintree and Goodwood. It is home to a number of retail chains and has a Morrisons supermarket. Its catchment area covers much of the Tees Valley and much of the north of
English of Northumbria (spoken in mining towns such as Ashington), Mackem (spoken in Wearside) and arguably Smoggie (Teesside). It is spoken mainly if not exclusively in the modern day counties of Northumberland, Tyne and Wear and Durham. The Anglo-Saxon kingdom of Northumbria was much more extensive than this, covering most parts of Yorkshire, and some parts of Cumbria, Lancashire and Scotland. The major Northumbrian dialects today are Geordie, Northern Northumbrian, Western Northumbrian, Southern Northumbrian or Pitmatic, Mackem, and arguably Smoggie, which is transitional between Northumbrian and Yorkshire English. To an outsider's ear the similarities between the dialects far outweigh the differences between the