Have a brown teapot with the letters P B.B. England on the bottom. Who made this?

These are the authentic English made Brown Betty teapots manufactured from red clay for better heat retention and better tasting tea. With history that goes back to the 1600s, the Brown Betty is reputed to make the best pot of tea in the world. According to lore, the shape of the pot and the red terracotta clay create a special cup of tea. I wish I could find more on your little tea pot, but there can be more than one PBB maker in England. I have listed a heart source below for you.