Manton and Gateford show the range
Bassetlaw District Council describes a varied local stock: Manton has a large former mining community and a high share of council homes, while the Gateford extension is largely owner occupied. Pockets of private rental sit around the town centre.
That difference does not determine a U-value. It does explain why age, wall build-up, alterations and insulation need to be checked at the address rather than borrowed from a town-wide assumption.