So what is the name of the county then? Local confusion abounds as to whether Cleveland still exists as an entity, or has been replaced with Teesside (or smogland), or has reverted to County Durham and North Yorkshire. See what happens when local government gets involved!
Definitely 2 s's in Teesside. Only ignorant webmasters providing links to equally ignorant webmasters' pages spell it wrong, and Geordies and Mackams only do it to annoy us.