I found a sherd with a piece of writing on it on the foreshore and found it looks very similar to a cute pearlware Child’s Alphabet Mug, circa 1830 on an antiques website.

I like the verses on it:

"G was a Gardener who works many hours.
H was a Hot-house to hold his choice flowers

A was an ass so stupid & dull.
B was a bee with her honey bag full.”

Full mug and photos here: https://junoantiques.com/childs-pearlware-alphabet-mug-ref-1382/

The rest of my finds included some more Staffordshire Slipware, a very speckled sherd with a bumpy texture, a piece of blue glass, and various other things: