Fascinating. I follow the Thames mudlark group and well-known mudlarkers on Facebook. Virtually every day people are finding Roman pottery, medieval jewelry and more. They had talked about this find too, as detectorists and searchers in the US, Australia and New Zealand also find things.
I only visited the Thames shore once, in March, but can’t wait to go back. In my few minutes there, I only found part of a 19th century pottery jar and Roman roof files (and possibly medieval tiles too). They find everything there from preRoman stuff to WWII shrapnel and Hindu river offerings.
Nice. The Romans built a lot of stuff out of pottery, prefabbed for the construction sites.