Help with an identification of these pieces please. I will post a link to my facebook page which is a lot easier then trying to spend time shrinking the pictures.
I have found the identical mark which is a B on a teapot which dated to the Barr period. but still unsure.
https://www.facebook.com/photo.php?fbid=158177707910943&set=pb.100011561443205.-2207520000.1460559844.&type=3&theater
http://www.lowerlodgeantiques.com/id73.html
I have looked through at least 6 different lists, histories and the Royal Worcester museum and have found nothing that says they used a B mark during the Barr period. The Blue and white above was Dr Wall period !! I have not found where Flight and Barr made Blue and white patterns,, but I may have missed that !! There are some Flight and Barr pics too and at the bottom is the mark used !! Will continue checking but I am pretty sure your cups are from a Japanese import Tea Set !!