Stoneware lidded pot, Denby?

Stoneware lidded pot with lovely running glaze, Made in England marked to base. It has an insert in the lid with a sponge in, any ideas what it was used for?

No idea personally, but that glaze looks sumptuous.

100% Denby, 1920s-30s.
Not an exact shape or glaze I've seen before, but almost certainly a tobacco jar,
they made many.
The lid is unusual, could be for "knocking" a pipe, like the knocker ash-trays.

I thought the base looked a bit Denby esque.