Dang, Christine beat me to it as we were out quiz-teaming tonight!
Yes, Sowerby - pattern 2266½ (why the half - dunno!) - the names Christine gave are those normally used by Carnival collectors I think. Adam Dodds said that Sowerby used the pattern numbers. It's shown in the 1940s & 1956 catalogues* with a chrome T-handle rather than your looped one; plate sizes given as a 7½" and an 8½" one; came in 6 colours: flint, amber, blue, green, pink, and sunglow (i.e. marigold Carnival).
The catalogues say that the glass could be supplied both with metalware and without, so it's entirely possible to see the cakestands with different handles.
* The catalogue images are those from the CD book:
Sowerby's Ellison Glass Works, Volume Two, by Glen and Stephen Thistlewood. (Well-worth buying these Sowerby CDs as they are full of catalogue copies, pottery gazette items, and Adam Dodds' reminiscences of his time as a glass technologist at the 3 great north-eastern glassmakers of Sowerby, and Davidson, and Jobling. For anyone collecting English pressed glass they are invaluable.)