_pauls - yes, I meant Wear.
I suspect the Tees area was selected due to its wider industrial hinterland and closer connections to those manufacturing towns in Yorkshire. Perhaps, somebody might like to count the number of Tory MPs in those winning areas - maybe that was a consideration.
When the scheme was first announced I compared the Blyth, Tyne, Wear, and Tees areas on Google Maps and did think that Blyth had lots going for it in terms of vacant sites and existing infrastructure, including a functioning railhead in the port itself. I doubted that Blyth would get the nod on its own due to a comparatively sparse industrial hinterland.
Perhaps, a better choice would have been the Wear (central to the area) then draw the 'inclusion zone' which could have included the whole area ... North to Blyth and South to Tees.