Richmond
"Richmond" was a British pottery company operated in the 20th century, particularly from the 1950s to around the 1970s.
According to my research, Richmond was under the Allied English Potteries Group.
So it was very similar to Royal Albert marks.
Richmond Marks
Typical Richmond mark
1950 ~
Some have just the Richmond mark, and some have a pattern name like below.
Richmond mark with pattern name
Blue Rock pattern