CREATE TABLE table_15520 ("Character" CLOB, "Original West End Cast" CLOB, "Original Broadway Cast" CLOB, "First UK Tour Cast" CLOB, "First US Tour Cast" CLOB)

What is the name of the person in the First UK Tour Cast for the Character of Sister Mary Robert?
SELECT "First UK Tour Cast" FROM table_15520 WHERE "Character" = 'sister mary robert'
SELECT "First UK Tour Cast" FROM "table_15520" WHERE "Character" = 'sister mary robert'