When did Coalport production leave Shropshire?

Museum and reference sources place the Shropshire factory’s end at 1926, with operations moving to Stoke-on-Trent after that point. A British Museum reference summary states production moved to Staffordshire in 1926. The Coalport China Museum presents the old works as an industrial site active through 1926, then preserved and opened to the public later. For dating, this split is useful: anything made at the original Coalport works must pre-date 1926, even if later pieces use Coalport branding. Base marks that mention later factory names or Staffordshire addresses point away from Shropshire production.