This teapot by James Sadler and Sons pottery has a stamp on the bottom, "Sadler,  Made in Staffordshire, England".
<a href="//commons.wikimedia.org/wiki/User:Aseev" title="User:Aseev">Dmitriy Aseev</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>