This is a bone china, Royal Standard "trio" of teacup, saucer and plate decorated in an Art Deco design.
Royal Standard was made by Chapmans Longton of Staffordshire. Their mark dates it between 1930 and 1949 and reads:
We like using non-identical, but similar trios to make up a tea set. They're interesting to use, nice to display and you can always change what's in the "set".
If you have any questions, just send an email to help@3bcshop.com.