From the Wikipedia page on Teeside [1].

Teesside is the name given to the conurbation in the north east of England, UK, made up of the towns of Middlesbrough, Stockton-on-Tees, Thornaby, Billingham and surrounding settlements near the River Tees. It was also the name of a local government district between 1968 and 1974—the County Borough of Teesside [2].

Teesside Archives collects and preserves archival material from churches, official and private sources.

The website is [3]