Hello, I have a couple of maker's marks images to that I wanted to add to a "John Yates" related post. There lots on the forum already so to not start another post I have added them here. My first image shows marks similar to "Liz's spoon marks but with the additional shield mark featuring the tradename "Silvern" referenced to be used by John Yates & Sons.

It is a clear actual version of a mark shown in a reply on another Forum post. Copied below is the image from that post. It lists some marks used by "John Yates" and "John Yates & Sons".
This next image is I presume of another John Yates & Sons tradename (trademark) but I have not seen it noted previously. We see the word "Silvera" along with a "Y&S" mark.

Fishless