CREATE TABLE table_3143 ("Result" CLOB, "Date" CLOB, "Race" CLOB, "Venue" CLOB, "Group" CLOB, "Distance" CLOB, "Weight" CLOB, "Jockey" CLOB, "Winner/2nd" CLOB)

What was the group in the British Champion Stakes?
SELECT "Group" FROM table_3143 WHERE "Race" = 'British Champion Stakes'
SELECT "Group" FROM "table_3143" WHERE "Race" = 'British Champion Stakes'