Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_18012738_1 (directed_by VARCHAR, uk_viewers__million_ VARCHAR)
### Question:
Name the total number directed by for uk viewers being 6.86
### Answer:
SELECT COUNT(directed_by) FROM table_18012738_1 WHERE uk_viewers__million_ = "6.86"