I submit two objections to the current proposals under consideration:
First, there appears no clear rationale for changing the name of the constituency from "Sedgefield" to "Billingham and Sedgefield". The Labour Party's official response was correct to argue that name changes should only be made when necessary.
Secondly, there appears no clear rationale for adding Billingham to the constituency. Under the current proposals, "Billingham and Sedgefield" will have more people (78,205) than any of the surrounding constituencies - see Hartlepool 77,215; Redcar and Cleveland 72,951; Middlesbrough and Eston 76,979; Stockton and Yarm 75,818; Darlington 74,929; City of Durham and Easington 77,002 and Bishop Auckland 71,135.
Retaining Billingham creates an extended boot-shaped area that looks - and feels - gerrymandered. Removing it would decrease voter size of constituency, but would keep Sedgefield above minimum. Either "Stockton and Yarm" (first preference) or "Middlesbrough and Eston" (second preference) would make a better fit.
Wynyard Village is on a peninsula part of Hartlepool which at least looks artificial. It would work better to put this within Sedgefield -- and for Sedgefield to keep the Trimdons north of Fishburn. This would unify Wynyard and Wynyard Village in the same constituency without dividing them (and dividing the community) as the current proposals support. Plus, Fishburn and the Trimdons (Grange, Colliery, Village) have historic ties with Sedgefield. Not only are they together now in the constituency, but major home construction in the area brings these areas together providing a form of communal coherence that these proposals disrupt. This should be avoided.
Adding some local villages that have strong communal ties while separating off Billingham (not in the constituency now anyway) would leave "Sedgefield" a geographically wide constituency, but provide greater communal coherence, produce a less radical redrawing of a well known constituency map avoiding artificial gerrymandered-looking boundaries and it could avoid separating the Wynyards or dividing the Trimdons.