CREATE TABLE table_70714 ("Dance" TEXT, "Best dancer ( s ) " TEXT, "Best score" FLOAT, "Worst dancer ( s ) " TEXT, "Worst score" FLOAT)

What's the best score, with the worst dancer(s) gethin jones/kenny logan?
SELECT "Best score" FROM table_70714 WHERE "Worst dancer(s)" = 'gethin jones/kenny logan'
SELECT "Best score" FROM "table_70714" WHERE "Worst dancer(s)" = 'gethin jones/kenny logan'