CREATE TABLE table_203_506 (id NUMBER, "opponent" CLOB, "played" NUMBER, "won" NUMBER, "lost" NUMBER, "drawn" NUMBER, "% won overall" CLOB)

against which country did the england women 's rfu not rate at an overall percentage of at least 70 % ?
SELECT "opponent" FROM table_203_506 WHERE "% won overall" < 70
SELECT "opponent" FROM "table_203_506" WHERE "% won overall" < 70